Promethazine
Generic Name: Promethazine
Uses & Medical Indications
Treatment of allergic conditions, motion sickness, nausea and vomiting
Nausea/Vomiting, Motion Sickness, Allergic Rhinitis, Sedation
Work Mechanism & Pharmacology
Patient Overview of Work Mechanism
Promethazine works at the cellular level to correct underlying biochemical imbalances, reduce clinical symptoms, and support overall health.
Clinical Mechanism of Action (MoA)
Promethazine exerts targeted therapeutic activity by interacting with specific cellular receptors, enzymatic pathways, or biological signaling cascades to relieve symptoms and restore physiological balance.
Dosage & Administration Guidelines
12.5-25 mg every 4-6 hours PRN
0.25-1 mg/kg every 4-6 hours PRN (Children >= 2 years)
Start at lower doses due to anticholinergic effects
100 mg/day
No specific adjustment required
Use with caution in hepatic impairment
Side Effects & Safety Warnings
Drowsiness, dry mouth, blurred vision, dizziness
Respiratory depression, extrapyramidal symptoms, neuroleptic malignant syndrome
Children < 2 years, coma, treatment of lower respiratory tract symptoms
Black box warning: Fatal respiratory depression in children < 2 years
Interactions (Drugs, Food & Alcohol)
CNS depressants, anticholinergics, MAOIs
N/A
Increases CNS depression significantly
Pregnancy & Breastfeeding Safety
Use if potential benefit justifies risk; avoid near term
Use caution; may inhibit lactation or cause sedation in infant
Patient Counseling & Practical Advice
Causes extreme drowsiness. Do not drive. Avoid alcohol.
Take as soon as remembered if needed. Skip if near next dose.
Respiratory rate, mental status, anticholinergic effects
When to Seek Urgent Medical Attention
Seek immediate emergency medical care (call emergency services or proceed to the nearest emergency department) if you experience signs of a life-threatening allergic reaction (anaphylaxis: facial, lip, tongue, or throat swelling causing airway obstruction), severe cutaneous blistering with skin peeling, sudden intense chest pain, or symptoms of overdose.
Content for Promethazine was synthesized from standardized public health monographs, official pharmacopoeias, and health authorities:
- Central Drugs Standard Control Organization (CDSCO) — National List of Essential Medicines
- World Health Organization (WHO) — Model List of Essential Medicines
- Indian Pharmacopoeia Commission (IPC) — Indian Pharmacopoeia Drug Monographs
- National Health Service (NHS) — Medicines A to Z Clinical Guidelines
The information provided on this website is for educational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of a qualified healthcare provider with any questions you may have regarding a medical condition.