BNF Promethazine Dosage Strengths Available
Standard Tablet Strengths
The British National Formulary specifies promethazine tablets in 10mg and 25mg strengths, with 25mg being the most commonly prescribed adult dose. EverydayMeds supplies Phenergan 25mg tablets containing promethazine hydrochloride, providing 56 tablets per pack for extended treatment courses. This strength is particularly suitable for evening doses when treating allergic conditions or short-term sleep difficulties.
Liquid Formulation Options
Promethazine elixir offers greater dosing flexibility at 5mg per 5ml concentration. This liquid formulation proves especially valuable for patients requiring dose adjustments or those who struggle with tablet swallowing. The 100ml bottle available through EverydayMeds provides multiple doses whilst maintaining stability and accurate measurement capabilities.
Clinical Dosing Applications
For allergic conditions, the BNF recommends 25mg at bedtime or divided doses of 10-20mg throughout the day. Sleep disturbances may require 25-50mg before bed, whilst motion sickness typically needs 25mg the evening before travel. The elixir formulation allows for precise dose titration, particularly beneficial when initiating treatment or managing sensitive patients.
Age-Related Considerations
Promethazine dosing varies significantly with age, making the 5mg/5ml elixir particularly valuable for paediatric applications. Adult patients generally tolerate the 25mg tablet strength well, though some may require dose adjustments based on individual response and concurrent medications. Both formulations available at EverydayMeds meet pharmaceutical standards for consistent drug delivery.
Treatment Duration Guidelines
The BNF emphasises short-term use for sleep-related applications, typically not exceeding 7-14 days. Allergy treatment may continue longer under medical supervision. Both tablet and elixir strengths provide flexibility for tapering doses when discontinuing treatment, particularly important given promethazine's sedating properties and potential for dependence with prolonged use.
