Critical Dosing and Safety Information
Emergency Dosing Guidelines
For adults experiencing acute allergic reactions, the standard Phenergan dose is 25mg orally, which may be repeated after 6 hours if necessary. EverydayMeds stocks Phenergan 25mg tablets ideal for emergency situations. For patients unable to swallow tablets, Phenergan Elixir 5mg/5ml provides flexible dosing at 5-10ml (25-50mg) for adults.
Urgent Contraindications
Never administer promethazine to children under 2 years due to fatal respiratory depression risk. Avoid in patients with severe heart conditions, narrow-angle glaucoma, or those taking MAOIs. Elderly patients require reduced doses due to increased sensitivity to anticholinergic effects.
Recognising Overdose Symptoms
Promethazine overdose may present with extreme drowsiness, confusion, dry mouth, dilated pupils, and potentially coma. In children, paradoxical excitement may occur before sedation. Respiratory depression is the most serious concern, particularly in young children.
Drug Interaction Alerts
Dangerous interactions include alcohol, opioids, benzodiazepines, and other CNS depressants which can cause severe respiratory depression. Avoid with tramadol due to increased seizure risk. MAOIs can intensify anticholinergic effects.
When to Seek Emergency Care
Contact emergency services immediately if the patient shows signs of severe allergic reaction despite treatment, difficulty breathing, loss of consciousness, or suspected overdose. Both tablet and elixir formulations available through EverydayMeds provide reliable treatment options when properly administered.
