Bromhexine, discovered in 1963, is a mucolytic drug used to treat respiratory conditions such as bronchitis. It works by thinning and loosening mucus in the airways, making it easier to cough up and clear congestion. Available in tablets, syrups, and solutions, Bromhexine is often included in combination with other cough and cold medications.
BRAND NAMES
Bisolvon – widely used in many countries for cough and mucus relief
Bramil – oral syrup and tablets
Bromhex – tablets and syrup forms
Bisol – alternative brand in some regions
MECHANISM OF ACTION
Bromhexine is a mucolytic that thins and loosens thick mucus in the airways by stimulating the production of thinner, watery secretions. This makes it easier for the cilia to clear mucus, helping improve cough efficiency and respiratory airflow.
PHARMACOKINETICS
Absorption
Bromhexine is rapidly absorbed from the gastrointestinal tract after oral administration. It reaches peak plasma concentrations within 1–2 hours, and its absorption may be influenced by food, though this does not significantly affect its overall bioavailability.
Distribution
The volume of distribution (Vd) of Bromhexine is approximately 3–5 L/kg in adults. This relatively large Vd reflects its wide tissue distribution, especially in the lungs and bronchial secretions where it exerts its mucolytic effect.
Metabolism
Bromhexine is extensively metabolized in the liver, primarily by the cytochrome P450 enzyme system, especially CYP3A4. It undergoes first-pass metabolism, producing active metabolites such as ambroxol, which also have mucolytic and secretolytic properties.
Excretion
Bromhexine and its metabolites are mainly excreted via the kidneys in urine, with a smaller amount eliminated in feces. Its elimination half-life is approximately 12 hours, allowing for twice- or thrice-daily dosing depending on the formulation.
PHARMACODYNAMICS
Bromhexine is a mucolytic that thins thick mucus and stimulates the production of watery secretions, making coughs more effective and improving airway clearance. Its active metabolite, ambroxol, further aids mucus breakdown in the respiratory tract.
ADMINISTRATION
Bromhexine is usually administered orally in the form of tablets, capsules, or syrup. It can be taken with or after meals to reduce gastrointestinal discomfort. The dosage and frequency depend on age, formulation, and severity of respiratory symptoms.
DOSAGE AND STRENGTH
Adults: 8–16 mg three times daily
Children 6–12 years: 8 mg two to three times daily
Children 2–5 years: 4 mg two to three times daily
Infants 0–2 years: 2–4 mg two to three times daily
FOOD INTERACTIONS
Bromhexine can be taken with or without food, as meals do not significantly affect its absorption, though taking it with food may help reduce stomach discomfort. No specific dietary restrictions are needed.
DRUG INTERACTIONS
Bromhexine may interact with drugs that affect liver enzymes, especially CYP3A4 inhibitors (like ketoconazole or erythromycin), which can increase Bromhexine levels in the blood. It may also enhance the effects of other mucolytics or cough medications and should be used cautiously with antitussives, as suppressing cough can reduce its effectiveness.
CONTRAINDICATIONS
Contraindications are conditions or factors that make a treatment or drug unsafe. They can be absolute (never use) or relative (use with caution). Knowing them helps prevent harm and adverse effects.
SIDE EFFECTS
Gastrointestinal: nausea, vomiting, diarrhea, abdominal discomfort
Allergic reactions: rash, itching, hives
Respiratory: mild bronchospasm (rare)
Other: headache, dizziness
OVERDOSE
Assess symptoms – Check for nausea, vomiting, diarrhea, or discomfort.
Stop the drug – Discontinue Bromhexine immediately.
Gastric care – Consider gastric lavage or activated charcoal if ingestion is recent (within 1–2 hours).
TOXICITY
Bromhexine has low toxicity, with overdose usually causing mild gastrointestinal symptoms like nausea and vomiting. Serious toxic effects are rare, making it generally safe at recommended doses.
