HYOSWISS

Indications

• Nausea and vomiting due to motion sickness
• Palliative care for excessive respiratory secretions
• Premedication prior to surgery
• Management of bowel colic

Dosage

Children: Refer to the BNF for Children for specific dosing information; dosage

Adults: For motion sickness, the recommended dosage is 150–300 micrograms taken 30 minutes before travel, followed by 150–300 micrograms every 6 hours as needed, with a maximum of 900 micrograms per day. For palliative care and other indications, doses may vary; refer to BNF for specific guidance.

Mechanism of action

Hyoscine hydrobromide exerts its effects by antagonizing muscarinic receptors, particularly M1 receptors located in the vestibular system and the vomiting center of the brain. This action reduces the excitatory input from the vestibular system, which is responsible for motion sickness. Additionally, it diminishes gastrointestinal motility and secretions, effectively alleviating symptoms of nausea and vomiting.

Pharmacodynamics

As an anticholinergic agent, hyoscine hydrobromide decreases the activity of the parasympathetic nervous system. Its sedative effects can also lead to drowsiness and sedation, which may be beneficial in some patients but could impair the ability to perform skilled tasks. Its antimuscarinic properties can result in side effects like dry mouth, urinary retention, and blurred vision due to reduced secretions and muscle relaxation.

Pharmacokinetics

Hyoscine hydrobromide is well absorbed after oral administration, with peak plasma concentrations typically reached within 1 hour. It has a half-life of approximately 3 to 6 hours. The drug is extensively metabolized in the liver, and its metabolites are excreted primarily through the kidneys. Its effects can vary based on the route of administration, with transdermal patches providing prolonged action.

Contra-indications

• Asthma
• Bronchiectasis
• Bronchitis
• Epilepsy
• Severe coronary artery disease
• Pyloroduodenal obstruction
• Susceptibility to angle-closure glaucoma
• Urinary retention

Adverse effects

• Anticholinergic syndrome
• Anxiety
• Decreased appetite
• Arrhythmia
• Blood disorders
• Increased bronchial secretion viscosity
• Confusion
• Dizziness
• Drowsiness
• Dry mouth
• Epigastric discomfort
• Fatigue
• Haemolytic anaemia
• Headache
• Hypotension
• Jaundice
• Movement disorders
• Muscle spasms
• Nightmares
• Palpitations
• Photosensitivity reaction
• Urinary retention
• Blurred vision

Interactions

• Antihistamines
• Sedatives
• Clozapine therapy

Precautions

• Caution in elderly patients due to increased susceptibility to anticholinergic side effects
• Use with caution in hepatic impairment
• Use with caution in renal impairment
• May impair performance of skilled tasks (e.g. driving or cycling) due to drowsiness

Pregnancy

Most manufacturers advise avoiding use during pregnancy; however, there is no evidence of teratogenicity. Use in the latter part of the third trimester may cause adverse effects in neonates such as irritability, paradoxical excitability, and tremor.

Breast-feeding

Most antihistamines are present in breast milk in varying amounts; although not known to be harmful, most manufacturers advise avoiding their use in breastfeeding mothers.

Storage

Store at room temperature, away from moisture and heat.

Formulations

• Tablets
• Sublingual tablets
• Transdermal patches
• Subcutaneous injection
• Intramuscular injection
• Continuous subcutaneous infusion

Indications

• Infections (topical treatment)
• Wound care (as an antiseptic)
• Ear infections (as an ear drop solution)
• Acid-base balance in metabolic acidosis

Dosage

Children: Refer to established guidelines as dosage may vary based on the formulation and indication.

Adults: Refer to established guidelines as dosage may vary based on the formulation and indication.

Mechanism of action

Acetic acid exerts its effects primarily through its ability to lower pH levels, creating an acidic environment which is inhospitable to many pathogens. It can disrupt the integrity of microbial cell membranes, leading to cell lysis and death. Additionally, acetic acid can promote the healing of wounds and enhance the absorption of certain medications when used as a solvent.

Pharmacodynamics

The pharmacodynamics of acetic acid involve its interaction with biological systems, leading to changes in cellular functions. Its acidic nature helps in the denaturation of proteins and disruption of microbial metabolism. This contributes to its antibacterial and antifungal activities, making it effective against a range of pathogens.

Pharmacokinetics

Acetic acid is rapidly absorbed in the gastrointestinal tract when ingested. It is metabolized primarily in the liver, converting to acetyl CoA and subsequently entering various metabolic pathways including the citric acid cycle. The elimination half-life varies but is generally short, with excretion occurring mainly via urine. When applied topically, absorption is minimal, and local effects are predominant.

Pregnancy

The safety of acetic acid during pregnancy has not been established. Use only if the potential benefit justifies the potential risk to the fetus.

Breast-feeding

There is no specific information available regarding the use of acetic acid during breastfeeding. Caution is advised.

Storage

Store in a cool, dry place away from direct sunlight. Keep tightly closed in a well-ventilated area.

Mechanism of action

Butyl compounds act by interacting with various biological pathways depending on their specific structure. For example, in the context of pharmaceutical use, they may function as solvents for drugs, enhancing solubility and bioavailability, or may have specific receptor interactions based on their functional groups. The precise mechanism of action would vary with the specific butyl derivative.

Pharmacodynamics

The pharmacodynamics of butyl compounds can vary widely. Generally, they may affect various physiological processes depending on their chemical nature. For example, butyl derivatives may exhibit anti-inflammatory, analgesic, or even anesthetic properties in certain contexts. The pharmacodynamic profile is largely dependent on the specific butyl compound and its interactions with cellular receptors and enzymes.

Pharmacokinetics

The pharmacokinetics of butyl compounds vary significantly among different derivatives. Commonly, these compounds are absorbed through various routes, depending on their formulation. They may undergo metabolic processes in the liver before being excreted primarily via urine. The exact absorption rates, half-lives, and clearance rates would depend on the specific butyl derivative and its formulation.

Pregnancy

There are no specific studies regarding the use of butyl compounds in pregnancy. Caution should be exercised.

Breast-feeding

There is limited information on the excretion of butyl compounds in human breast milk. Caution is advised.

Storage

Store in a well-closed container, protected from light and moisture.

Indications

• Irritable bowel syndrome
• Other gastrointestinal disorders associated with smooth muscle spasms

Dosage

Children: Refer to the BNF for Children for specific dosing information.

Adults: Refer to the BNF for specific dosing information.

Mechanism of action

Butylbromide acts as a competitive antagonist of muscarinic acetylcholine receptors. This inhibition decreases the contractility of smooth muscle in the gastrointestinal tract, leading to reduced spasms and discomfort. It predominantly affects the parasympathetic nervous system, which regulates involuntary bodily functions.

Pharmacodynamics

The pharmacodynamic effects of butylbromide include relaxation of smooth muscle and reduction of secretions in the gastrointestinal tract. This results in decreased gastrointestinal motility and relief from cramping and pain associated with smooth muscle contractions. The onset of action is typically rapid, making it effective for acute symptoms.

Pharmacokinetics

Butylbromide is absorbed from the gastrointestinal tract following oral administration. It is distributed throughout the body, with a preference for tissues with high cholinergic activity. The drug undergoes hepatic metabolism, and its metabolites are excreted primarily through the urine. The half-life and exact pharmacokinetic parameters can vary depending on individual patient factors.

Pregnancy

Butylbromide should be used in pregnancy only if the potential benefit justifies the potential risk to the fetus.

Breast-feeding

It is not known whether butylbromide is excreted in human milk. Caution should be exercised when administering to breastfeeding mothers.

Storage

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

Indications

• Topical treatment of localized infections
• Antiseptic for skin and mucous membrane applications
• Astringent in certain dermatological conditions

Dosage

Children: Refer to professional resources for specific dosing information, as it can vary based on formulation and condition treated.

Adults: Refer to professional resources for specific dosing information, as it can vary based on formulation and condition treated.

Mechanism of action

Glacial acetic acid exerts its effects primarily through its acidic properties, leading to protein denaturation and cell lysis in microbial cells. This action disrupts cellular integrity, promoting the death of bacteria and fungi. Additionally, it can alter the pH of tissues, which may contribute to its antiseptic effects.

Pharmacodynamics

The pharmacodynamic effects of glacial acetic acid are largely attributed to its ability to lower the pH in the local environment, which can inhibit the growth of certain pathogens. Its astringent properties help to reduce secretions and promote tissue contraction, which can be beneficial in managing conditions that involve inflammation or excessive exudation.

Pharmacokinetics

Glacial acetic acid is absorbed through the skin and mucous membranes when applied topically. Once absorbed, it can be metabolized by the liver, with elimination primarily occurring through urine. The exact pharmacokinetic parameters can vary based on the route of administration and the formulation used, but detailed data on half-life and volume of distribution are not well-characterized in standard references.

Pregnancy

Glacial acetic acid should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus. It is classified as a category C drug.

Breast-feeding

It is not known whether glacial acetic acid is excreted in human milk. Caution should be exercised when administering to nursing mothers.

Storage

Store in a tightly closed container, in a cool, dry place away from incompatible substances.

Indications

• Motion sickness
• Nausea and vomiting
• Pre-operative sedation
• Spasmodic disorders of the gastrointestinal tract

Dosage

Children: Refer to the BNF for Children for specific dosing guidelines.

Adults: Refer to the BNF for specific dosing guidelines.

Mechanism of action

Hyoscine exerts its effects primarily by antagonizing muscarinic acetylcholine receptors, which inhibits cholinergic transmission in the central nervous system and peripheral tissues. This results in decreased gastrointestinal motility, reduced salivation, and diminished vestibular sensitivity, which are beneficial in preventing nausea and vomiting associated with motion sickness.

Pharmacodynamics

The pharmacodynamic effects of hyoscine include sedation, amnesia, reduction of motion sickness symptoms, and relaxation of smooth muscles in the gastrointestinal tract. These actions are dose-dependent, and the drug may also exhibit peripheral anticholinergic effects such as decreased secretions in the respiratory tract.

Pharmacokinetics

Hyoscine is well absorbed from the gastrointestinal tract and can also be administered transdermally or via injection. It has a bioavailability of approximately 90% when taken orally. The drug undergoes extensive hepatic metabolism, and its elimination half-life is about 3 to 6 hours. It is primarily excreted in the urine as metabolites, and the onset of action varies based on the route of administration.

Contra-indications

• Hypersensitivity to hyoscine or any of its excipients
• Myasthenia gravis
• Severe glaucoma
• Prostatic hypertrophy
• Obstructive gastrointestinal disease

Adverse effects

• Drowsiness
• Confusion
• Dry mouth
• Blurred vision
• Constipation
• Urinary retention
• Tachycardia

Interactions

• clozapine+hyoscine: Unknown (additive effect)
• antipsychotics, second generation+hyoscine: Unknown (additive effect)

Precautions

• Use with caution in patients with cardiovascular disease
• May impair the ability to drive or operate machinery
• Caution in patients with a history of seizures

Pregnancy

Hyoscine should be used in pregnancy only if the potential benefit justifies the potential risk to the fetus. Consult relevant guidelines.

Breast-feeding

Hyoscine is excreted in breast milk. Caution should be exercised when administering to breastfeeding mothers.

Storage

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

Formulations

• Tablets
• Injectable solution
• Transdermal patch

Indications

• Pain management
• Vaccination
• Antibiotic therapy
• Hormonal therapies
• Anesthesia
• Nutritional support
• Chemotherapy

Dosage

Children: Refer to specific drug guidelines for paediatric dosing, as it requires careful consideration of weight and age.

Adults: Refer to specific drug guidelines for adult dosing, as it varies widely depending on the medication and clinical condition.

Mechanism of action

The mechanism of action of injected drugs varies widely based on the specific medication being administered. Generally, injected drugs enter the bloodstream directly, allowing them to circulate rapidly throughout the body. For instance, antibiotics may work by inhibiting bacterial cell wall synthesis, while analgesics may modulate pain pathways in the central nervous system. Each drug has unique pathways through which it achieves its therapeutic effects.

Pharmacodynamics

Pharmacodynamics refers to the effects of drugs on the body and their mechanisms of action. For injectable medications, effects can be immediate or delayed, depending on the drug's formulation and route of administration. Factors influencing pharmacodynamics include receptor affinity, drug concentration, and the presence of other substances that may enhance or inhibit the drug's effects. For example, some injectable drugs may require specific receptors to exert their effects, while others may have a broader range of action.

Pharmacokinetics

Pharmacokinetics involves the absorption, distribution, metabolism, and excretion (ADME) of injected drugs. After administration, drugs are rapidly absorbed into the bloodstream, leading to quick therapeutic effects. The distribution depends on factors such as blood flow, tissue permeability, and protein binding. Drugs are metabolized primarily in the liver and excreted through the kidneys or bile. The pharmacokinetic profile can vary widely based on the drug's chemical nature, dosage, and individual patient factors.

Pregnancy

Safety during pregnancy depends on the specific injection and its active ingredients. It is essential to consult a healthcare professional for guidance.

Breast-feeding

The safety of injections during breastfeeding varies by the specific medication. It is recommended to seek advice from a healthcare provider.

Storage

Store injections as per manufacturer's guidelines, usually in a cool, dry place away from direct sunlight. Some may require refrigeration.