ZOLPILIN-10

Indications

• Dry eye conditions
• Tear deficiency
• Keratoconjunctivitis sicca

Dosage

Children: Apply as required, typically in the form of eye drops.

Adults: Apply as required, typically in the form of eye drops.

Mechanism of action

Hypromellose acts by forming a viscous gel upon contact with the ocular surface, which helps to retain moisture and protect against irritants. This gel-like property enhances the stability of the tear film and reduces evaporation, thereby alleviating symptoms associated with dry eye conditions.

Pharmacodynamics

The pharmacodynamic effects of hypromellose are primarily related to its ability to mimic natural tears, providing lubrication to the ocular surface. This lubrication reduces friction during blinking and maintains corneal hydration, which is critical for ocular comfort and health. Its high viscosity also contributes to prolonged retention time on the eye surface.

Pharmacokinetics

Hypromellose is administered topically as eye drops and is not significantly absorbed systemically. The retention time of hypromellose on the ocular surface is enhanced due to its viscosity, allowing for extended relief of dry eye symptoms. The elimination of hypromellose occurs primarily through drainage from the eye and dilution by the natural tear fluid.

Adverse effects

• Temporary visual disturbance
• Eye irritation

Precautions

• Should not be used during contact lens wear
• Use with caution in patients with known hypersensitivity to any component of the formulation

Pregnancy

Hypromellose is generally considered safe for use during pregnancy. However, it should be used only if clearly needed and after consulting a healthcare provider.

Breast-feeding

Hypromellose is unlikely to affect breastfed infants when used as directed, but consultation with a healthcare provider is advisable.

Storage

Store in a cool, dry place away from direct sunlight. Once opened, use within a specified period as indicated on the packaging.

Formulations

• {'name': 'Teardew', 'concentration': '0.3%', 'form': 'eye drops', 'volume': '10 ml'}
• {'name': 'Xailin Hydrate', 'concentration': '0.3%', 'form': 'eye drops', 'volume': '10 ml'}
• {'name': 'AacuLose', 'concentration': '0.3%', 'form': 'eye drops', 'volume': '10 ml'}
• {'name': 'Artelac', 'concentration': '0.32%', 'form': 'eye drops', 'volume': '10 ml'}
• {'name': 'Lacrilube', 'concentration': '2 mg/g', 'form': 'eye ointment', 'volume': '3.5 g'}
• {'name': 'Celluvisc', 'concentration': '1%', 'form': 'eye drops', 'volume': '0.4 ml unit dose'}

Indications

• Insomnia
• Difficulty in sleep onset
• Short-term treatment of sleep disorders

Dosage

Children: Zolpidem is not recommended for use in

Adults: The recommended dose for adults is 10 mg taken orally immediately before bedtime. In older patients or those with hepatic impairment, a lower dose of 5 mg is advised.

Mechanism of action

Zolpidem exerts its effects by selectively binding to the benzodiazepine site of the GABA-A receptor, enhancing the inhibitory neurotransmitter gamma-aminobutyric acid (GABA). This action results in increased neuronal inhibition, facilitating sleep onset and reducing wakefulness. Zolpidem's selectivity for certain GABA-A receptor subtypes is believed to contribute to its favorable side effect profile compared to traditional benzodiazepines.

Pharmacodynamics

The pharmacodynamic effects of zolpidem include sedation, anxiolysis, and muscle relaxation. It has a rapid onset of action that allows for effective sleep induction, with studies indicating that it can decrease sleep latency and increase total sleep time. Due to its short half-life, zolpidem is particularly effective for initiating sleep rather than maintaining it.

Pharmacokinetics

Zolpidem is rapidly absorbed following oral administration, with peak plasma concentrations occurring approximately 1.5 to 2 hours post-dose. Its bioavailability is about 70%, and it exhibits a volume of distribution of approximately 1.2 L/kg. The drug is primarily metabolized in the liver by cytochrome P450 enzymes, particularly CYP3A4, and has a half-life of about 2 to 3 hours, leading to minimal accumulation with repeated dosing. Zolpidem is excreted mainly in the urine as metabolites, with less than 1% excreted unchanged.

Adverse effects

• Abdominal pain
• Anterograde amnesia
• Anxiety
• Back pain
• Diarrhoea
• Dizziness
• Fatigue
• Hallucination
• Headache
• Increased risk of infection
• Nausea
• Sleep disorders
• Vomiting
• Confusion
• Diplopia
• Irritability
• Angioedema
• Behavioural abnormality
• Depression
• Skin reactions
• Speech disorder
• Withdrawal syndrome

Precautions

• Use with caution in elderly patients due to potential for protracted daytime sedation and/or ataxia.
• Caution in hepatic impairment due to risk of decreased clearance.
• Use with caution in renal impairment.

Pregnancy

Avoid regular use due to the risk of neonatal withdrawal symptoms; high doses during late pregnancy or labour may cause neonatal hypothermia, hypotonia, and respiratory depression.

Breast-feeding

Small amounts present in milk-avoid.

Storage

Store in a cool, dry place away from direct sunlight.

Formulations

• Modified-release tablets
• Oral solution
• Capsules

Indications

• Constipation
• Dietary fiber supplementation
• Irritable bowel syndrome
• Diverticular disease
• Weight management

Dosage

Children: Refer to appropriate guidelines for specific dosage; generally taken with adequate fluid intake.

Adults: Refer to appropriate guidelines for specific dosage; generally taken with adequate fluid intake.

Mechanism of action

Cellulose acts primarily as a bulk-forming laxative. It absorbs water in the intestines, which increases stool bulk and stimulates peristalsis, thus facilitating bowel movements. Additionally, cellulose is not digestible by human enzymes, leading to fermentation by gut bacteria, which may enhance gut health and alter gut microbiota composition.

Pharmacodynamics

Cellulose increases stool weight and frequency of bowel movements. It works by retaining water in the intestines, leading to softer stools and improved passage through the gastrointestinal tract. The bulking effect of cellulose can help alleviate constipation and promote overall digestive health. It may also play a role in cholesterol reduction and glycemic control through its effects on digestion and absorption of nutrients.

Pharmacokinetics

Cellulose is not absorbed into the bloodstream due to its indigestible nature. Instead, it passes through the gastrointestinal tract, where it adds bulk to the stool. Its fermentation by colonic bacteria produces short-chain fatty acids, which may have beneficial effects on colon health. The onset of action for cellulose as a laxative can vary but is generally within 24 to 72 hours after ingestion.

Adverse effects

• Bloating
• Flatulence
• Diarrhea
• Abdominal discomfort

Precautions

• Use with caution in patients with a history of gastrointestinal disorders.
• Monitor for potential allergic reactions in sensitive individuals.

Pregnancy

Cellulose is generally considered safe during pregnancy as it is a non-toxic, indigestible fiber.

Breast-feeding

Cellulose is also considered safe during breastfeeding; it is excreted in breast milk in negligible amounts.

Storage

Store in a cool, dry place away from direct sunlight.

Formulations

• Powder
• Capsules
• Tablets
• Granules

Pregnancy

There is limited data on the safety of color additives during pregnancy. Use only if clearly needed and after consultation with a healthcare provider.

Breast-feeding

The safety of color additives during breastfeeding is not well studied. Use with caution and consult a healthcare provider.

Storage

Store in a cool, dry place away from direct sunlight. Keep out of reach of children.

Dosage

Children: Refer to specific clinical guidelines for dosing in children, as no standard paediatric dosage is specified in the provided resources.

Adults: Refer to specific clinical guidelines for dosing, as no standard adult dosage is specified in the provided resources.

Mechanism of action

Ethylene glycol toxicity results from its metabolism to glycolic acid and other toxic metabolites. Glycolate accumulates in the body and is eliminated more slowly than ethylene glycol itself. The renal excretion of both compounds plays a crucial role in their elimination, accounting for a significant portion of the administered dose.

Pharmacodynamics

The pharmacodynamics of glycolate are closely tied to its role as a metabolite of ethylene glycol. Its accumulation can lead to metabolic acidosis, although minimal clinical effects have been observed at low doses. The relationship between glycolate and ethylene glycol indicates that glycolate may contribute to the overall toxic effects of ethylene glycol ingestion.

Pharmacokinetics

The pharmacokinetics of glycolate indicate that it reaches peak plasma levels between 4-6 hours after the administration of ethylene glycol. The elimination half-life of ethylene glycol is approximately 1.7 hours in rats and 3.4 hours in dogs. Glycolate is predominantly eliminated through renal excretion, with about 5% of the dose being excreted unchanged.

Pregnancy

There is limited data on the safety of glycolate in pregnancy. Caution is advised.

Breast-feeding

Data on the excretion of glycolate in human milk is not available. Caution is advised.

Storage

Store at room temperature, away from light and moisture.

Indications

• Lactose intolerance
• As a filler or excipient in pharmaceutical formulations

Dosage

Children: Refer to the BNF for Children for specific dosing information based on age and clinical context.

Adults: Refer to the BNF for specific dosing information based on clinical context.

Mechanism of action

Lactose is metabolized in the intestine by the enzyme lactase into its constituent monosaccharides, glucose and galactose. In individuals with lactase deficiency, unabsorbed lactose passes into the colon, where it is fermented by bacteria, leading to gas production and osmotic effects that contribute to diarrhea.

Pharmacodynamics

The pharmacodynamics of lactose are primarily related to its effects on gastrointestinal function. In healthy individuals, lactose is effectively broken down into glucose and galactose, which are absorbed and utilized for energy. In individuals with lactose intolerance, the unabsorbed lactose can cause osmotic diarrhea and colonic fermentation, leading to discomfort and symptoms associated with lactose intolerance.

Pharmacokinetics

Lactose is not absorbed in the gastrointestinal tract until it is hydrolyzed into glucose and galactose by lactase. The absorption of glucose and galactose occurs in the small intestine. The half-life is not applicable as lactose is not typically administered as a medication but is rather ingested as a natural component of food. Its metabolism primarily occurs in the intestine.

Adverse effects

• Bloating
• Diarrhea
• Abdominal pain
• Flatulence

Precautions

• Use with caution in patients with lactose intolerance.
• Consider potential for gastrointestinal upset in sensitive individuals.

Pregnancy

Lactose is generally considered safe for use during pregnancy. However, consult a healthcare professional for individual advice.

Breast-feeding

Lactose is safe to use while breastfeeding, as it is a natural sugar present in breast milk.

Storage

Store in a cool, dry place, away from direct sunlight.

Formulations

• Powder
• Granules
• Tablets
• Syrup

Indications

• Used as an excipient in tablet formulations
• Used as a bulking agent in capsule formulations
• Used in food products as a thickener or stabilizer

Dosage

Children: Refer to specific product guidelines as dosage will depend on the formulation and the active ingredients.

Adults: Refer to specific product guidelines as dosage will depend on the formulation and the active ingredients.

Mechanism of action

Microcrystalline cellulose acts as a non-digestible filler that enhances the flow properties of powders during the manufacturing of tablets and capsules. It does not have a direct pharmacological action on the body but ensures that the active ingredients are effectively delivered to the patient.

Pharmacodynamics

As a non-active ingredient, microcrystalline cellulose does not exert pharmacodynamic effects typical of active pharmaceutical ingredients. Its primary role is to provide a stable and consistent matrix for the drug, facilitating the release of the active compound once ingested.

Pharmacokinetics

Microcrystalline cellulose is not absorbed in the gastrointestinal tract; it passes through the digestive system largely unchanged. It adds bulk to the stool, which may aid in promoting regular bowel movements. The substance is excreted in feces, where it contributes to dietary fiber intake.

Pregnancy

Data regarding the use of microcrystalline cellulose during pregnancy is limited. It is advisable to consult with healthcare professionals before use.

Breast-feeding

Microcrystalline cellulose is considered safe during breastfeeding, as it is not absorbed systemically.

Storage

Store in a cool, dry place away from direct sunlight and moisture.

Mechanism of action

Oxides do not have a single mechanism of action as they are a broad category of compounds. However, in general, metal oxides can exhibit catalytic properties, while non-metal oxides may participate in biochemical reactions by forming acids or bases upon dissolution in water.

Pharmacodynamics

The pharmacodynamics of oxides depend on the specific type of oxide and its interaction with biological systems. For instance, metal oxides may have antimicrobial properties, while certain non-metal oxides can influence metabolic pathways through their acid-base chemistry. The effects vary widely, necessitating specific studies for each oxide's role in therapeutic contexts.

Pharmacokinetics

The pharmacokinetics of oxides are also variable. Many metal oxides are poorly soluble and thus have limited absorption when ingested. Non-metal oxides, such as carbon dioxide, can be readily absorbed and utilized in metabolic processes. The distribution, metabolism, and excretion of oxides depend on their chemical form and the biological system in which they are involved.

Pregnancy

Not applicable as oxide is not a drug but a class of chemical compounds.

Breast-feeding

Not applicable as oxide is not a drug but a class of chemical compounds.

Storage

Store in a cool, dry place away from direct sunlight.

Dosage

Children: Refer to specific drug formulations and product labels as purified substances can vary widely in their use and dosing.

Adults: Refer to specific drug formulations and product labels as purified substances can vary widely in their use and dosing.

Mechanism of action

The mechanism of action for purified compounds varies widely depending on the specific substance. Generally, purified drugs exert their effects by interacting with specific biological targets, such as receptors, enzymes, or ion channels, leading to a desired therapeutic effect. This interaction can involve binding to receptors to activate or inhibit signaling pathways, modulating enzymatic activity, or altering physiological processes.

Pharmacodynamics

Pharmacodynamics describes the effects of a drug on the body and the relationship between drug concentration and effect. For purified drugs, this can involve dose-response relationships and the time course of their action. The purified form often enhances potency and reduces variability in response among patients, which can lead to more predictable therapeutic outcomes. The overall effect is determined by the drug's affinity for its target, the efficacy of the drug-receptor interaction, and the downstream signaling pathways activated as a result of this interaction.

Pharmacokinetics

Pharmacokinetics involves the absorption, distribution, metabolism, and excretion (ADME) of a drug. For purified substances, absorption can be more efficient due to the absence of impurities that may affect solubility or stability. Distribution may also be enhanced, leading to higher bioavailability. Metabolism can be influenced by the structure of the purified compound, as it may be metabolized more readily by liver enzymes. Excretion typically occurs through the kidneys or liver, depending on the molecular characteristics of the purified drug.

Pregnancy

Consult with a healthcare professional, as the safety of purified forms of medications during pregnancy may vary depending on the specific substance.

Breast-feeding

Consult with a healthcare professional, as the safety of purified forms of medications during breastfeeding may vary depending on the specific substance.

Storage

Store in a cool, dry place, away from light and moisture, and keep out of reach of children.

Indications

• Burns
• Surgical wounds
• Chronic ulcers
• Pressure sores
• Skin grafts

Dosage

Children: Refer to the specific guidelines in the BNF for Children based on the type and severity of the wound.

Adults: Apply Spraycel as directed, ensuring the wound is clean and dry prior to application. The dressing should be changed regularly based on the wound condition and clinical judgement.

Mechanism of action

Spraycel works by forming a protective film over the wound surface that helps to retain moisture and prevent bacterial contamination. The formulation may contain various components that support the healing process, including hydrocolloids or alginates, which provide hydration and promote a natural healing environment.

Pharmacodynamics

The pharmacodynamic properties of Spraycel are primarily related to its ability to create a moist wound environment and form a barrier against pathogens. This helps to reduce inflammation, promote cell migration, and support tissue regeneration. By maintaining moisture, the dressing also minimizes pain and enhances patient comfort during the healing process.

Pharmacokinetics

As a topical application, Spraycel is not systemically absorbed in significant amounts. Its pharmacokinetics are largely localized to the site of application. The dressing remains in place for an extended period, allowing for continuous delivery of its beneficial effects directly to the wound without significant systemic exposure.

Pregnancy

Consult healthcare professional before use, as safety in pregnancy has not been established.

Breast-feeding

Consult healthcare professional before use, as safety during breastfeeding is not well documented.

Storage

Store at room temperature, away from moisture and heat. Keep out of reach of children.

Formulations

• Topical spray

Indications

• Nutritional supplementation
• Energy source in enteral nutrition
• Excipient in pharmaceutical formulations

Dosage

Children: Refer to specific guidelines or product inserts for dosing information, as it can vary based on the context of use.

Adults: Refer to specific guidelines or product inserts for dosing information, as it can vary based on the context of use.

Mechanism of action

Starch is broken down into glucose units by enzymes such as amylase during digestion. The glucose is then absorbed in the intestines and utilized for energy production in the body's cells. This pathway involves hydrolysis of the glycosidic bonds, converting starch into simpler sugars.

Pharmacodynamics

Starch primarily serves as an energy source. Its digestion and absorption lead to an increase in blood glucose levels, which provides energy for metabolic processes. In this context, it plays a crucial role in maintaining energy homeostasis in the body.

Pharmacokinetics

Starch is not absorbed in its polymeric form; it must first be enzymatically hydrolyzed into simpler sugars such as maltose and glucose. The digestion and absorption of starch occur predominantly in the small intestine, with glucose being readily absorbed into the bloodstream. The rate of absorption can vary depending on the type of starch and its physical form.

Adverse effects

• Allergic reactions
• Gastrointestinal discomfort
• Diarrhea
• Constipation

Precautions

• Use with caution in individuals with known allergies to starch or starch derivatives
• Monitor for gastrointestinal symptoms in patients with a history of digestive disorders

Pregnancy

Starch is generally considered safe for use during pregnancy. However, it should be consumed in moderation as part of a balanced diet.

Breast-feeding

Starch is deemed safe for nursing mothers when used in moderation as part of a balanced diet.

Storage

Store in a cool, dry place away from moisture and direct sunlight.

Formulations

• Powder
• Granules
• Tablets
• Suspensions

Pregnancy

No specific data available, consult a healthcare professional.

Breast-feeding

No specific data available, consult a healthcare professional.

Storage

Store in a cool, dry place away from light.

Indications

• Insomnia characterized by difficulty in falling asleep
• Short-term management of sleep disorders

Dosage

Adults: The recommended starting dose for adults is 10 mg taken immediately before bedtime, with a maximum dose of 10 mg. For women, the initial dose is often reduced to 5 mg due to differences in pharmacokinetics. It is advised to ensure at least 7-8

Mechanism of action

Zolpidem interacts with the GABA-A receptor complex, specifically binding to the BZ1 receptor subtype. This selective binding leads to an enhancement of GABAergic transmission, resulting in sedative, anxiolytic, and muscle relaxant effects. Unlike benzodiazepines, which are non-selective, zolpidem primarily affects the alpha 1, 2, and 3 subunits of the GABA receptor, which are associated with sleep induction and anxiolytic properties.

Pharmacodynamics

Zolpidem exhibits CNS depressant effects, which include somnolence, sedation, decreased alertness, and drowsiness. It acts quickly, typically inducing sleep within 30 minutes of administration, and is designed for short-term use due to potential dependence and tolerance. While it is effective for sleep initiation, there is evidence of anterograde amnesia, especially at higher doses, suggesting caution with dosing and use in certain populations.

Pharmacokinetics

Zolpidem is rapidly absorbed, with peak plasma concentrations occurring approximately 1.5 hours after oral administration. The drug has a half-life of about 2.5 hours, allowing it to be effective without causing prolonged sedation. It is metabolized primarily by the liver via cytochrome P450 enzymes, and its elimination may be affected by drugs that induce or inhibit these enzymes, potentially leading to altered exposure.

Adverse effects

• somnolence
• decreased alertness
• sedation
• drowsiness
• dizziness
• anterograde amnesia

Interactions

• carbamazepine+zolpidem: Unknown (decreases exposure)
• rifampicin+zolpidem: Unknown (decreases exposure)

Pregnancy

There are no adequate and well-controlled studies in pregnant women. Use only if the potential benefit justifies the potential risk to the fetus.

Breast-feeding

Zolpidem is excreted in human milk. Caution should be exercised when administering to a nursing woman.

Storage

Store at room temperature, away from light and moisture. Keep out of reach of children.

Formulations

• Zolpidem tartrate tablets

Mechanism of action

Ethylene glycol toxicity results from its metabolism to glycolic acid and other toxic metabolites. The accumulation of glycolate and the elimination kinetics of ethylene glycol and its metabolites are not well understood, so studies with male Sprague-Dawley rats and mixed breed dogs have been carried out. Ethylene glycol was administered by gavage to rats and dogs which were placed in metabolic cages for urine and blood sample collection at timed intervals. The peak plasma level of ethylene glycol occurred at 2 hr after dosing and that of glycolate between 4-6 hr. The rate of ethylene glycol elimination was somewhat faster in rats with a half-life of 1.7 hr compared to 3.4 hr in dogs. The maximum plasma level of glycolate was greater in rats although the pattern of accumulation was similar to that in dogs. Glycolate disappeared from the plasma at the same time as ethylene glycol, suggesting a slower rate of elimination of the metabolite than that of ethylene glycol. Renal excretion of ethylene glycol was an important route for its elimination accounting for 20-30% of the dose. Renal excretion of glycolate represented about 5% of the dose. Ethylene glycol induced an immediate, but short lived diuresis compared to that in control rats. Minimal clinical effects (mild acidosis with no sedation) were noted at these doses of ethylene glycol (1-2 g/kg) in both rats and dogs. The results indicate that the toxicokinetics of ethylene glycol and glycolate were similar in both species. The effect of 0.35 to 0.8 mmol/kg glycolic acid and 1.0 to 4.4 mmol/kg sodium glycolate on cyclopropane-epinephrine induced cardiac arrhythmias was examined using dogs. Doses of 0.35 to 0.5 mmol/kg glycolic acid increased the duration of arrhythmias in the 13 dogs tested, whereas doses >0.5 mmol/kg decreased or totally eliminated the arrhythmias in each of 11 dogs. Depression was observed for many of the dogs at higher doses. Sodium glycolate was much less effective in decreasing the arrhythmias, with 3 mmol/kg being required and its action being transient.

Mechanism of action

Zolpidem, the active moiety of zolpidem tartrate, is a hypnotic substance with a chemical structure that is not related to the structure benzodiazepines, barbiturates, pyrrolopyrazines, pyrazolopyrimidines or other drugs exerting hypnotic effects. It interacts with a _GABA-BZ_ receptor complex and shares various pharmacological properties with the _benzodiazepine_ class of drugs. Subunit binding of the _GABAA_ receptor chloride channel macromolecular complex is thought to lead to the sedative, anticonvulsant, anxiolytic, and myorelaxant drug effects of zolpidem. The main regulatory site of the GABAA receptor complex can be found on its _alpha (α) subunit_ and is called the _benzodiazepine_ (BZ) or _omega (ω)_ receptor. At least three different subtypes of the (ω) receptor have been identified to this date. In contrast to benzodiazepine drugs, which are found to modulate all benzodiazepine receptor subtypes in a non-selective fashion, zolpidem binds the (BZ1) receptor specifically with a potent affinity for the alpha 1/alpha 5 subunits (in vitro). More recent studies suggest that zolpidem binds primarily to the alpha 1, 2, and 3 subunits of the GABA receptor,,, and not the alpha 5 subunit. The (_BZ1_) receptor is found primarily on the Lamina IV of the brain sensorimotor cortical regions, substantia nigra (pars reticulata), cerebellum molecular layer, olfactory bulb, ventral thalamic complex, pons, inferior colliculus, and globus pallidus. Specific and selective binding of zolpidem on the (BZ1) receptor is not considered absolute, however, this binding could potentially explain the relative lack of myorelaxant and anticonvulsant activity in animal studies in addition to the preservation of deep sleep (stages 3 and 4) in human studies of zolpidem at hypnotic doses.

Pharmacodynamics

**Effects on the central nervous system (CNS)** This drug has CNS depressant effects, which may include somnolence, decreased alertness, sedation, drowsiness, dizziness, and other changes in psychomotor function. Due to the above effects, the FDA has recommended an initial dose of zolpidem (immediate-acting) is a single dose of 5 mg for women and a single dose of 5 or 10 mg for men, immediately before bedtime with at least 7-8 hours remaining before the planned time of awakening. Refer to product labeling for detailed information,. **Effects on memory** Controlled studies in adults using objective measures of memory demonstrated no significant evidence of next-day memory impairment after the administration of zolpidem. On the contrary, in a clinical study involving the administration of zolpidem doses of 10 and 20 mg, a marked reduction in a next-morning recall of information relayed to subjects during peak drug effect (90 minutes after dosing) was observed. These subjects experienced a condition known as _anterograde amnesia_. Subjective evidence from adverse event data has suggested that anterograde amnesia may occur after zolpidem administration, mainly at doses above 10 mg. **Effects on psychomotor function** This drug may cause decreased psychomotor performance. Additive psychomotor effects may occur with other drugs that cause depression of psychomotor function, including alcohol. Patients taking zolpidem should be cautioned against participating in hazardous activities or occupations requiring complete mental alertness or motor coordination, including operating machinery or driving a motor vehicle after ingesting the drug. Potential impairment of the performance of the above types of activities may also occur the day after zolpidem ingestion, especially at higher doses and ingestion of the extended-release form,. **Effects on insomnia and sleep stages** Evidence suggests that this drug is associated with minimal rebound insomnia. During clinical trials with patients using zolpidem on an ‘as-needed’ basis, zolpidem use resulted in global improvements in sleep. Zolpidem has been demonstrated to decrease sleep latency (the time it takes to fall asleep) for up to 35 days in controlled clinical studies. In studies measuring the percentage of sleep time spent in each sleep stage, zolpidem has primarily been shown to preserve sleep stages. Sleep time spent in stages 3 and 4 (deep sleep) was measured as similar to placebo with only minor and inconsistent changes in REM (paradoxical) sleep at the recommended dose. **Next-day residual effects** In 2013, the FDA issued a statement warning that patients who take zolpidem extended-release (Ambien CR)―either 6.25 mg or 12.5 mg―should not drive or participate in other activities requiring full mental alertness the day after taking the drug, due to the fact that zolpidem concentrations can remain increased the next day, and impair the ability to perform these activities,. Patients may decrease their risk of next-morning impairment by taking the lowest dose of their insomnia medicine that treats their symptoms, according to the FDA. Specific dosing recommendations for both men and women are included in this statement. This information is also available on product labeling,. **Rebound effects** There was no polysomnographic (objective) evidence of rebound insomnia at normal doses, in studies evaluating sleep on the nights following discontinuation of zolpidem tartrate. Subjective evidence of impaired sleep in the elderly on the first post-treatment night was observed at doses higher than the recommended 5mg dose for elderly patients.