Decozal 0.05% Nasal Drops

Indications

• Nasopharyngitis (common cold)
• Sinusitis (acute)
• Nasal congestion

Dosage

Children: For children aged 12-17 years, the recommended dosage is 2-3 drops of a 0.1% solution or 1 spray into each nostril 1-3 times a day as required, with a maximum duration of use of 7 days. Caution is advised for children under 12 years, as use is generally not recommended in younger children.

Adults: For adults, the usual dosage is 0.1% solution, administered as 1 spray into each nostril up to 3 times a day as required, with a maximum duration of use of 7 days.

Mechanism of action

Xylometazoline acts as an alpha-adrenergic agonist, stimulating alpha-1 adrenergic receptors on vascular smooth muscle, leading to vasoconstriction. This action reduces blood flow to the nasal mucosa, decreasing swelling and congestion. The onset of action is rapid, providing quick relief from nasal obstruction.

Pharmacodynamics

The pharmacodynamic effects of xylometazoline include significant vasoconstriction of nasal mucosa blood vessels, which leads to decreased nasal congestion. This effect can last for several hours, making it effective for acute conditions. However, prolonged use may lead to rebound congestion due to tolerance development.

Pharmacokinetics

Xylometazoline is administered intranasally, allowing for localized effects with minimal systemic absorption. Peak plasma concentrations are typically reached shortly after administration, although due to its local action, systemic effects are usually minimal. The metabolism and elimination pathways are not well characterized but are believed to involve hepatic metabolism and renal excretion.

Contra-indications

• Hypersensitivity to xylometazoline or any of its excipients
• Severe cardiovascular disease
• Closed-angle glaucoma
• Children under 6 years of age

Adverse effects

• Cardiovascular effects
• Headache
• Hypersensitivity reactions
• Nasal dryness
• Nausea
• Paresthesia
• Visual impairment
• Rebound congestion (rhinitis medicamentosa) with prolonged use
• Agitated psychosis, ataxia, hallucinations, and rare fatalities in infants and children under 6 years

Interactions

• Other sympathomimetics
• Vasoconstrictors

Precautions

• Use with caution in patients with diabetes mellitus
• Hypertension
• Hyperthyroidism
• Prolonged use should be avoided to prevent rebound congestion

Pregnancy

Manufacturer advises avoiding use during pregnancy due to insufficient data on safety.

Breast-feeding

Manufacturer advises caution as no information is available regarding the safety of xylometazoline during breastfeeding.

Storage

Store below 25°C. Do not freeze. Keep the container tightly closed.

Formulations

• {'name': 'Otrivine', 'type': 'Nasal spray', 'strength': '0.1%', 'volume': '15 ml'}
• {'name': 'Sudafed Sinus-Ease', 'type': 'Nasal drops', 'strength': '1 mg per 1 ml', 'volume': '10 ml'}

Indications

• Seborrhoeic dermatitis
• Dandruff
• Scalp psoriasis
• Bacterial infections affecting the scalp

Dosage

Children: For children, apply 3 times a week for 1 week, then apply twice weekly as needed. Refer to BNF for Children for further details.

Adults: Apply to the affected area as directed, typically 1-3 times weekly depending on the condition being treated. Refer to specific product guidelines for detailed dosing.

Mechanism of action

Benzalkonium chloride exerts its antimicrobial effect by disrupting the cell membrane of microorganisms, leading to leakage of cellular contents and ultimately cell death. This is facilitated by its cationic nature, which allows it to bind to negatively charged bacterial surfaces.

Pharmacodynamics

Benzalkonium chloride demonstrates rapid bactericidal activity, with effectiveness observed against gram-positive and gram-negative bacteria, fungi, and some viruses. Its antiseptic properties may be enhanced in the presence of moisture and are typically influenced by the concentration of the solution used.

Pharmacokinetics

Benzalkonium chloride is poorly absorbed through the skin. After topical application, it remains primarily at the site of application, where it exerts localized effects. Systemic absorption is minimal, and it is primarily eliminated through the skin and urine. However, specific pharmacokinetic data may vary based on formulation and application site.

Pregnancy

Benzalkonium chloride should be used with caution during pregnancy. Refer to specific guidelines or consult a healthcare professional.

Breast-feeding

Benzalkonium chloride should be used with caution while breastfeeding. Refer to specific guidelines or consult a healthcare professional.

Storage

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

Formulations

• Shampoo
• Soap or detergent
• Topical solution

Indications

• Disinfection of surfaces
• Antiseptic for skin
• Preservative in pharmaceuticals
• Treatment of minor cuts and abrasions

Dosage

Children: Refer to the BNF for Children for specific dosing recommendations in pediatric populations.

Adults: Refer to the BNF for specific formulations and concentrations as doses may vary based on the application and preparation.

Mechanism of action

The bactericidal action of benzalkonium chloride is believed to result from the disruption of intermolecular interactions, which leads to the dissociation of cellular membrane lipid bilayers in bacteria. This disruption compromises cellular permeability, causing leakage of vital cellular contents. Moreover, the agent can deactivate important molecular complexes such as enzymes that regulate various respiratory and metabolic activities within the cells. Cationic surfactants like benzalkonium chloride can thus effectively disrupt critical intermolecular interactions and tertiary structures in biochemical systems, impairing bacterial function.

Pharmacodynamics

Benzalkonium chloride is classified as a biocidal agent with a relatively long duration of action. It exhibits a spectrum of activity against various microorganisms, including bacteria, certain viruses, fungi, and protozoa; however, it is ineffective against bacterial spores. The agent tends to demonstrate greater efficacy against gram-positive bacteria compared to gram-negative ones. The mode of action can be bacteriostatic (preventing growth) or bactericidal (killing bacteria), depending on its concentration. The activity of benzalkonium chloride is generally stable across different pH levels but is enhanced at elevated temperatures and with extended exposure.

Pharmacokinetics

The pharmacokinetic properties of benzalkonium chloride, including absorption, distribution, metabolism, and excretion, are not fully characterized. Its topical application limits systemic exposure, and it primarily exerts localized effects at the site of application. The duration of action and efficacy may be influenced by the formulation and concentration used.

Pregnancy

Benzalkonium chloride is generally considered safe for use during pregnancy when applied topically, but systemic absorption should be minimized. Always consult a healthcare provider for use during pregnancy.

Breast-feeding

Benzalkonium chloride is considered safe for topical application during breastfeeding, but care should be taken to avoid exposure to the infant. Consultation with a healthcare provider is recommended.

Storage

Store at room temperature, away from moisture and heat. Keep in a tightly closed container, protected from light.

Formulations

• Topical solution
• Disinfectant wipes
• Liquid antiseptics

Dosage

Children: Refer to specific formulations and clinical guidelines for dosing information as this can vary widely based on the context of use.

Adults: Refer to specific formulations and clinical guidelines for dosing information as this can vary widely based on the context of use.

Mechanism of action

Dibasic compounds often act by providing a buffering effect in biological systems, which helps to maintain physiological pH levels. They may also interact with various biological targets depending on their specific structure, influencing metabolic pathways and cellular functions.

Pharmacodynamics

The pharmacodynamics of dibasic compounds is highly variable and depends on their specific chemical structure and the context of their use. Generally, these compounds may alter the absorption and distribution of other drugs, modulate enzyme activity, or affect cellular signaling pathways through their interactions with biological molecules.

Pharmacokinetics

The pharmacokinetics of dibasic compounds can vary widely. Factors such as solubility, stability, and route of administration influence their absorption, distribution, metabolism, and excretion. Typically, dibasic compounds may be absorbed in the gastrointestinal tract and may undergo various metabolic processes depending on their specific nature.

Pregnancy

Dibasic compounds should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus. Consult with a healthcare provider.

Breast-feeding

Caution is advised when administering dibasic compounds to breastfeeding mothers. Consult with a healthcare provider.

Storage

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

Indications

• Lead poisoning
• Mercury poisoning
• Calcium overload
• Certain diagnostic procedures involving heavy metals

Dosage

Children: Refer to the BNF for Children for appropriate dosing information tailored for paediatric patients.

Adults: Refer to the BNF for specific dosing guidelines based on the condition being treated, considering factors such as the severity of metal poisoning and renal function.

Mechanism of action

Edetate functions by forming stable complexes with divalent and trivalent metal ions, including lead and calcium, through its multiple carboxylate and amine groups. This chelation renders the metals more soluble and promotes their renal excretion, thereby reducing their toxic effects in the body.

Pharmacodynamics

The chelation of metals by edetate decreases the free metal concentration in the bloodstream, which mitigates the toxic effects associated with heavy metal accumulation. The efficacy of edetate in removing metals such as lead has been well documented, and its ability to bind calcium can influence calcium homeostasis in certain clinical scenarios.

Pharmacokinetics

Edetate is administered intravenously, with rapid distribution throughout the extracellular fluid. It is primarily excreted unchanged by the kidneys. The onset of action occurs quickly after administration, and the duration depends on the dose and the patient's renal function. The elimination half-life is approximately 1 hour but may vary based on renal clearance.

Contra-indications

• Hypersensitivity to edetate or any component of the formulation
• Severe renal impairment
• Active bleeding disorders

Adverse effects

• Hypocalcemia
• Nausea
• Vomiting
• Diarrhea
• Abdominal pain
• Headache
• Rash
• Fever

Interactions

• May enhance the effects of anticoagulants
• Concurrent use with calcium supplements may reduce effectiveness
• May interfere with the absorption of certain medications due to changes in gastrointestinal motility

Precautions

• Use with caution in patients with renal impairment
• Monitor electrolyte levels, particularly calcium, during treatment
• Assess the patient's hydration status before administration

Pregnancy

Limited data on the use of edetate in pregnancy. Use only if the potential benefit justifies the potential risk to the fetus.

Breast-feeding

Caution is advised as it is not known whether edetate is excreted in human milk. Weigh the risks and benefits before use.

Storage

Store in a cool, dry place, protected from light. Do not freeze.

Formulations

• Edetate disodium injection
• Edetate calcium disodium injection

Dosage

Children: Refer to specific drug guidelines or BNF for Children for appropriate dosing information in paediatric populations.

Adults: Refer to specific drug guidelines or BNF for appropriate dosing information, as this can vary widely based on the condition being treated.

Mechanism of action

The mechanism of action would depend on the specific drug in question. Generally, medications work by interacting with specific receptors, enzymes, or pathways in the body, leading to therapeutic effects. For example, some drugs may inhibit enzymes that contribute to disease processes, while others may modulate receptor activity to enhance or inhibit physiological responses.

Pharmacodynamics

Pharmacodynamics involves the study of the effects of drugs and their mechanisms of action in the body. The relationship between drug concentration and its effect can vary widely among different classes of medications. Highly effective drugs may have a steep dose-response curve, meaning small changes in dose can lead to significant changes in effect.

Pharmacokinetics

Pharmacokinetics describes the absorption, distribution, metabolism, and excretion (ADME) of drugs. Highly effective medications may have specific pharmacokinetic profiles that optimize their therapeutic effects while minimizing side effects. This includes considerations like half-life, bioavailability, and clearance rates which can influence dosing regimens.

Pregnancy

Consult with a healthcare provider before use; safety profile during pregnancy is not well established.

Breast-feeding

Consult with a healthcare provider; safety during breastfeeding is not well established.

Storage

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

Indications

• pH regulation in biological systems
• buffering agents in pharmaceutical formulations
• stabilizers in chemical reactions

Dosage

Children: Refer to specific monobasic compound guidelines for pediatric dosing information, as this varies widely based on the specific application and formulation.

Adults: Refer to specific monobasic compound guidelines for dosing information, as this varies widely based on the specific application and formulation.

Mechanism of action

Monobasic compounds, depending on their chemical nature, often act by dissociating into their respective ions in solution. This dissociation can influence the pH and ionic strength of the solution, which in turn can affect various biochemical reactions and cellular functions.

Pharmacodynamics

The pharmacodynamic effects of monobasic compounds are largely dependent on their specific chemical structure and the physiological context. Generally, they can modulate pH levels, affect enzyme activity, and influence ion transport across cell membranes. These compounds may also play a role in maintaining homeostasis in biological systems.

Pharmacokinetics

The pharmacokinetics of monobasic compounds can vary widely based on their formulation and route of administration. Typically, they are rapidly dissociated in biological fluids, allowing for immediate effects on pH and ionic balance. They may be absorbed systemically or act locally, depending on their intended use.

Pregnancy

Safety in pregnancy has not been established; use only if clearly needed.

Breast-feeding

Caution is advised; consult a healthcare professional before use.

Storage

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

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

• Used as an emulsifier in pharmaceutical formulations
• Improving the solubility of poorly soluble drugs
• Stabilizing emulsions in topical and oral medications
• Used in laboratory settings as a surfactant

Dosage

Children: Dosage varies based on formulation and intended use, refer to specific product guidelines.

Adults: Dosage varies based on formulation and intended use, refer to specific product guidelines.

Mechanism of action

Tween works by reducing the surface tension of the liquid it is mixed with, allowing for better mixing of hydrophilic and hydrophobic substances. This property makes it effective in enhancing the delivery of drugs that are poorly soluble in water. Tween can also stabilize emulsions by forming a protective layer around droplets, preventing them from coalescing.

Pharmacodynamics

As a surfactant, Tween enhances the solubility of lipophilic compounds and improves the absorption of drugs through biological membranes. Its application in drug formulation can lead to increased bioavailability and improved therapeutic effects, especially for poorly soluble drugs.

Pharmacokinetics

Tween is generally not absorbed significantly in the gastrointestinal tract when ingested. Instead, it has a local effect in the gastrointestinal tract and may influence the absorption of other compounds. The metabolism of Tween is not well characterized, and its excretion primarily occurs through feces. The overall pharmacokinetic profile is influenced by the specific formulation in which it is used.

Pregnancy

Tween (polysorbate 20) is generally considered safe for use during pregnancy. However, it should be used only when clearly needed and after consultation with a healthcare provider.

Breast-feeding

Tween is considered safe for use during breastfeeding. Its absorption and systemic exposure are minimal, but it is advisable to consult a healthcare provider.

Storage

Store at room temperature, away from moisture and heat. Keep tightly closed in a cool, dry place.

Indications

• Nasal congestion due to rhinosinusitis
• Allergic rhinitis
• Non-allergic rhinitis
• Common cold-related nasal congestion

Dosage

Adults: For adults, the typical dose is 0.1% to

Mechanism of action

Xylometazoline acts primarily as an agonist at α_2B-adrenergic receptors, with additional activity at α_1A-, α_2A-, α_2C-, α_1B-, and α_1D-adrenergic receptors. This agonistic action leads to vasoconstriction of the blood vessels in the nasal mucosa, decreasing nasal resistance during breathing and enhancing airflow. The drug's vasoconstrictive properties also contribute to symptomatic relief of associated conditions, such as earache and sore throat, which may arise from mouth breathing due to nasal congestion.

Pharmacodynamics

Xylometazoline is effective in reducing nasal congestion, with a median onset of relief approximately 1.7 minutes after administration and peak relief at around 30 minutes. Its vasoconstrictive effect can lead to rebound swelling and congestion if used long-term, with potential for rhinitis medicamentosa. The drug also exhibits antioxidant properties, which may protect against oxidative stress associated with inflammation in the nasal passages.

Pharmacokinetics

Xylometazoline is rapidly absorbed when administered nasally, although specific pharmacokinetic parameters such as half-life and bioavailability are not well-documented. Its effects are relatively short-lived, necessitating careful management of dosing to avoid rebound congestion. Regular use past the recommended duration can lead to diminished efficacy and increased risk of adverse effects.

Adverse effects

• Rebound congestion
• Nasal mucosa irritation
• Dryness of the nasal mucosa
• Headache
• Nausea

Interactions

• volatile halogenated anesthetics + xylometazoline: Unknown (additive effect)

Precautions

• Use with caution in patients with cardiovascular disease
• Use with caution in patients with hypertension
• Use with caution in patients with hyperthyroidism
• Avoid prolonged use to prevent rebound congestion

Pregnancy

Use during pregnancy only if clearly needed, as safety in pregnancy has not been established.

Breast-feeding

Use with caution, as it is not known whether xylometazoline is excreted in human milk.

Storage

Store below 30°C. Protect from light.

Formulations

• Nasal spray
• Nasal drops

Mechanism of action

Although not entirely elucidated, the bactericidal action of benzalkonium chloride is believed to be due to the disruption of intermolecular interactions. Such disruption can cause the dissociation of cellular membrane lipid bilayers of bacteria, resulting in compromised cellular permeability control and the leakage of important cellular contents. Additionally, other important molecular complexes like enzymes which control the maintenance of a great range of respiratory and metabolic cellular activities, are also susceptible to such deactivation. Consequently, a variety of critical intermolecular interactions and tertiary structures in very highly specific biochemical systems that allow bacterial agents to function normally can be readily disrupted or deactivated by cationic surfactants like benzalkonium chloride..

Pharmacodynamics

Benzalkonium chloride solutions are generally categorized as biocidal agents with relative long durations of action. Their spectrum of activity has been demonstrated against bacteria, to some viruses, fungi, and protozoa, although bacterial spores are treated as being resistant to the agent. Additionally, the agent generally shows more activity against gram-positive than gram-negative bacteria. Finally, solutions of benzalkonium chloride are bacteriostatic or bactericidal based on their concentration. Bacteriostatic agents act to prevent further growth of bacterial organisms that are present while bactericidal agents function to kill bacteria that are present. In general, the activity of the agent is not largely affected by pH, but such activity does increase substantially at higher temperatures and prolonged exposure times.

Mechanism of action

Nasal congestion is caused by various etiologies, such as rhinosinusitis and allergic or non-allergic rhinitis, leading to congestion of the venous sinusoids lining the nasal mucosa. Activation of α-adrenergic receptors leads to vasoconstriction of the blood vessels of the nasal mucosa and resumption of nasal airflow. As the most abundantly expressed in the human nasal mucosa, α_1A- and α_2B-adrenoceptors may play the most important role in vasoconstriction of the human nasal mucosa. Xylometazoline is a more selective agonist at α_2B-adrenoceptors, with affinity at α_1A-, α_2A-, α_2C-, α_1B-, and α_1D-adrenoceptors. Xylometazoline decreases nasal resistance during inspiration and expiration and increases the volume of nasal airflow. Compared to [oxymetazoline], another imidazoline nasal decongestant, xylometazoline had a slightly faster onset of action although they had a similar duration of action. In one study, subjects with nasal congestion reported relief of earache and sore throat in addition to nasal decongestion: it is speculated that oxymetazoline mediates this effect by causing vasoconstriction of the nasal mucosa that contains the venous sinuses and nasal decongestion allows breathing through the nose, providing relief from sore throat caused by mouth breathing that dries and irritates the throat.

Pharmacodynamics

Xylometazoline is a sympathomimetic agent that causes vasoconstriction of the nasal mucosa. In one study comprising subjects with nasal congestion associated with the common cold, the median time of onset of subjective relief of nasal congestion was about 1.7 minutes and the time of subjective peak relief of nasal congestion was 30 minutes. Previous studies reported rebound swelling, rebound nasal congestion, rhinitis medicamentosa, and shorter duration of decongestant effect from the long-term use of xylometazoline in healthy volunteers, suggesting that the drug is most effective if used temporarily. An early _in vitro_ study demonstrated xylometazoline to exert anti-oxidant actions, where it inhibited microsomal lipid peroxidation and mediated hydroxyl radical scavenging activity. This suggests that xylometazoline has a beneficial effect against oxidants, which play a role in tissue damage in inflammation.