AMBCET 30/5MG SYRUP

Indications

• Chronic obstructive pulmonary disease (COPD)
• Asthma
• Bronchitis
• Respiratory infections with excessive mucus production

Dosage

Children: For children aged 2 to 5 years, the recommended dose is 15 mg to 30 mg daily, divided into two or three doses. For children aged 6 to 12 years, the recommended dose is 30 mg to 60 mg daily, divided into two or three doses.

Adults: The usual adult dose is 30 mg to 120 mg daily, divided into two or three doses.

Mechanism of action

Ambroxol acts by stimulating the secretion of serous mucus in the respiratory tract, which helps to reduce the viscosity of sputum. This mucolytic action enhances the clearance of mucus, facilitating expectoration. It may also influence the production of surfactant in the lungs, contributing to improved lung function.

Pharmacodynamics

Ambroxol exhibits a dose-dependent effect on mucus viscosity and secretion. By enhancing mucociliary clearance, it aids in reducing airway obstruction and improving respiratory function. The onset of action typically occurs within a few hours after administration, with peak effects observed within 1 to 2 days of treatment.

Pharmacokinetics

Ambroxol is well absorbed after oral administration, with a bioavailability of approximately 70%. It is metabolized primarily in the liver through conjugation and oxidation, resulting in active metabolites. The elimination half-life is about 10 hours, and the drug is excreted predominantly via urine, both as unchanged drug and metabolites.

Contra-indications

• Hypersensitivity to ambroxol or any of the excipients
• Severe hepatic impairment
• Severe renal impairment

Adverse effects

• Gastrointestinal disturbances (nausea, vomiting, diarrhea)
• Skin reactions (rash, urticaria)
• Headache
• Dizziness
• Dry mouth
• Anaphylactic reactions (rare)

Interactions

• Ambroxol may enhance the absorption of other drugs due to its mucolytic properties
• Caution should be exercised when used with other cough suppressants

Precautions

• Use with caution in patients with a history of peptic ulcer disease
• Avoid use in patients with asthma unless prescribed by a healthcare professional
• Monitor renal and hepatic function in patients with pre-existing conditions

Pregnancy

Ambroxol should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus. Data on human pregnancy are limited.

Breast-feeding

Ambroxol is excreted in breast milk. Caution is advised when administering to nursing mothers.

Storage

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

Formulations

• Oral solution
• Syrup
• Tablets
• Effervescent tablets

Indications

• Allergic rhinitis
• Seasonal allergic rhinitis
• Perennial allergic rhinitis
• Chronic idiopathic urticaria

Dosage

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

Adults: Refer to the BNF for specific dosing guidelines.

Mechanism of action

Cetirizine selectively antagonizes peripheral H1 receptors, thereby inhibiting the effects of histamine, a chemical responsible for allergic symptoms. It blocks the action of histamine at the H1 receptor site, reducing symptoms associated with allergic reactions.

Pharmacodynamics

The onset of action for cetirizine is typically within 1 hour of administration, with peak effects occurring around 2 to 3 hours post-dose. The duration of action can last up to 24 hours, allowing for once-daily dosing. Cetirizine exhibits a lower affinity for the central nervous system H1 receptors, resulting in reduced sedation compared to older antihistamines.

Pharmacokinetics

Cetirizine is well absorbed from the gastrointestinal tract, with a bioavailability of approximately 93%. It is primarily metabolized in the liver, but the extent of hepatic metabolism is low, as most of the drug is excreted unchanged in the urine. The elimination half-life is about 8 to 10 hours in adults, and renal function can significantly affect its clearance.

Contra-indications

• Hypersensitivity to cetirizine or any of the excipients
• Severe renal impairment

Adverse effects

• Drowsiness
• Dry mouth
• Dizziness
• Fatigue
• Nausea
• Headache

Interactions

• Alcohol may enhance the sedative effects
• CNS depressants may have additive effects
• Theoretical interactions with other antihistamines

Precautions

• Caution in patients with epilepsy or at risk of seizures
• Caution in patients with impaired renal function
• May impair the ability to drive or operate machinery

Pregnancy

Cetirizine should only be used during pregnancy if the benefits outweigh the risks. Limited data suggests it is not harmful, but caution is advised.

Breast-feeding

Cetirizine is excreted in breast milk. Exercise caution when administering to breastfeeding mothers.

Storage

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

Formulations

• Tablets
• Oral solution
• Chewable tablets