ADULT COUGH MIXTURE

Indications

• Severe acute diarrhoea when other treatments are ineffective (specialist use only)
• Palliative care for pain management

Dosage

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

Adults: Initially 500 micrograms daily, adjusted according to response, maximum daily dose to be given in divided doses; maximum 16 mg per day.

Mechanism of action

Opium exerts its effects primarily through the activation of opioid receptors in the central nervous system (CNS), particularly the mu-opioid receptor. This leads to inhibition of neurotransmitter release, resulting in reduced perception of pain and altered emotional response to painful stimuli. Additionally, its action on peripheral opioid receptors can decrease gastrointestinal motility, which is beneficial in treating diarrhoea.

Pharmacodynamics

Opium produces its analgesic effects by binding to opioid receptors, leading to a decrease in the transmission of pain signals and an increase in pain tolerance. It also causes sedation and euphoria, which can contribute to its potential for misuse. Tolerance may develop with prolonged use, and its withdrawal can lead to severe physical and psychological symptoms.

Pharmacokinetics

Opium is absorbed from the gastrointestinal tract, and its active components undergo extensive metabolism in the liver. The half-life of morphine, the primary active component, varies but typically ranges from 2 to 4 hours. Excretion occurs primarily via the kidneys. The pharmacokinetic profile can be influenced by factors such as liver function and concurrent medications.

Contra-indications

• Hypersensitivity to opium or any of its components
• Severe respiratory depression
• Acute or severe bronchial asthma
• Paralytic ileus
• Acute abdominal condition
• Concurrent use with monoamine oxidase inhibitors (MAOIs)

Adverse effects

• Constipation
• Sedation
• Nausea
• Vomiting
• Dizziness
• Dry mouth
• Euphoria
• Potential for dependence or abuse
• Respiratory depression

Interactions

• CNS depressants (e.g., alcohol, benzodiazepines) may enhance sedation
• MAO inhibitors can increase the risk of severe reactions
• Concurrent use with other opioids can lead to additive effects

Precautions

• Use with caution in elderly patients
• Caution in patients with liver disease
• Monitor for signs of respiratory depression
• Careful assessment of any history of substance abuse

Pregnancy

Opium is not recommended during pregnancy due to potential risks of dependence in the fetus and withdrawal symptoms at birth.

Breast-feeding

Use with caution; the amount excreted in breast milk is likely too small to be harmful, but monitoring of the infant is advised.

Storage

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

Formulations

• Opium tincture
• Opium powder
• Opium tablets
• Opium capsules

Indications

• Muscle pain
• Joint pain
• Rheumatism
• Strains and sprains
• Minor aches

Dosage

Children: Refer to specific product guidelines. Consult the BNF for Children for appropriate dosing based on age and weight.

Adults: Apply to the affected area as directed, usually 3-4 times daily. Refer to specific product guidelines for concentration and formulation.

Mechanism of action

Camphor exerts its effects primarily through the activation of transient receptor potential (TRP) channels, particularly TRPA1 and TRPV3, which mediates sensations of pain and temperature. This activation leads to a local warming sensation and increased blood flow to the area, which contributes to its analgesic and anti-inflammatory effects. Camphor may also have a mild antibacterial effect.

Pharmacodynamics

Camphor's pharmacodynamic effects include local irritation leading to an increase in blood circulation to the area of application, which helps in alleviating pain and inflammation. It can stimulate nerve endings, providing a counterirritant effect that interrupts pain signals. Additionally, camphor may evoke a cooling sensation which can provide symptomatic relief from discomfort.

Pharmacokinetics

Camphor is absorbed through the skin and can enter systemic circulation, although its effects are primarily local. The absorption rate can vary based on the formulation and concentration used. Camphor is metabolized in the liver and is excreted mainly in the urine. Its half-life can vary but is generally short, necessitating frequent application for sustained effects.

Contra-indications

• Hypersensitivity to camphor or any of the excipients
• Severe renal impairment
• Severe hepatic impairment
• History of seizures or epilepsy

Adverse effects

• Skin irritation
• Allergic reactions including rash or itching
• Nausea
• Vomiting
• Headache
• Dizziness
• Increased heart rate
• Seizures in high doses

Interactions

• May interact with anticoagulants, increasing the risk of bleeding
• Caution in patients taking other CNS stimulants or depressants

Precautions

• Use with caution in patients with a history of seizures
• Avoid application to broken skin or mucous membranes
• Not to be ingested or applied to large areas of skin

Pregnancy

Camphor should be used with caution during pregnancy. High doses may be harmful to the fetus.

Breast-feeding

Camphor is excreted in breast milk; use with caution and consult a healthcare professional.

Storage

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

Formulations

• Camphorated oil
• Camphor cream
• Camphor ointment
• Camphor patches

Indications

• Herbal remedy for anxiety
• Support for digestive health
• Anti-inflammatory support
• Antimicrobial effects
• Pain relief
• Support for immune function

Dosage

Children: Refer to specific tincture product instructions for dosage, as this varies significantly based on the plant and concentration.

Adults: Refer to specific tincture product instructions for dosage, as this varies significantly based on the plant and concentration.

Mechanism of action

The mechanism of action of tinctures depends on the specific herbs or plants used in their preparation. Generally, the active compounds extracted from the plant material interact with various biological pathways, including receptor modulation, enzyme inhibition, and antioxidant activity. For example, flavonoids and alkaloids found in many tinctures may exhibit anti-inflammatory, analgesic, or antimicrobial effects through their interaction with cellular signaling pathways.

Pharmacodynamics

The pharmacodynamics of tinctures is influenced by the specific constituents of the herbal material. These constituents may exert effects such as enhancing or inhibiting neurotransmitter activity, modulating inflammatory responses, or influencing metabolic pathways. The effects can vary widely among different tinctures based on the plant used, the extraction method, and the concentration of the active ingredients.

Pharmacokinetics

The pharmacokinetics of tinctures involves absorption, distribution, metabolism, and excretion of the active compounds. After administration, the alcohol or vinegar solvent aids in the rapid absorption of these compounds through the mucosal membranes or gastrointestinal tract. Once absorbed, the compounds are distributed throughout the body and may undergo metabolic transformations primarily in the liver. The elimination half-life varies based on the specific herb and its active constituents, with some compounds being excreted unchanged while others are metabolized into active or inactive metabolites.

Contra-indications

• Hypersensitivity to any component of the tincture
• Severe liver disease
• Pregnancy (specific tinctures may vary)

Adverse effects

• Skin irritation
• Allergic reactions
• Gastrointestinal upset
• Drowsiness or sedation (depending on the active ingredient)

Interactions

• May interact with alcohol, increasing sedative effects
• Potential interactions with other CNS depressants
• May affect the metabolism of certain drugs via hepatic pathways

Precautions

• Use cautiously in patients with a history of substance abuse
• Monitor liver function in patients with liver disease
• Caution in operating machinery or driving due to potential drowsiness

Pregnancy

Generally not recommended during pregnancy due to potential risks associated with alcohol and other active ingredients.

Breast-feeding

Caution is advised, as components may pass into breast milk and affect the infant.

Storage

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

Formulations

• Tinctures of various herbs and compounds, including but not limited to: echinacea, valerian, and calendula