Phenergan Emergency Guide: Quick Reference

Phenergan (promethazine) is a sedating antihistamine used for allergic reactions, nausea, and sleep difficulties. This emergency guide provides essential dosage information, safety warnings, and immediate actions for common Phenergan situations. Whether using tablets or elixir, understanding proper usage helps ensure safe and effective treatment when you need it most.

  • Adult allergy dose: 25mg at night or 10-20mg 2-3 times daily
  • Sleep aid: 25-50mg at bedtime (short-term use only)
  • Never exceed maximum daily dose of 100mg
  • Avoid alcohol and driving due to drowsiness effects
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Available Treatments

Choose between Phenergan tablets or Phenergan elixir to suit your needs, and buy online for fast, effective relief from allergies, motion sickness, and short-term sleep difficulties.

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Phenergan 25mg (Promethazine Hydrochloride) - 56 Tablets

£14.99

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Phenergan Elixir 5mg/5ml Oral Solution – 100ml

£14.49

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Emergency Dosing and Safety Information

Immediate Dosage Guidelines

For allergic reactions in adults, take 25mg (one tablet) at night, or 10-20mg two to three times daily if daytime use is necessary. When using Phenergan Elixir 5mg/5ml, measure carefully using the provided spoon. For sleep difficulties, 25-50mg at bedtime may help, but this should only be used short-term. EverydayMeds stocks both Phenergan 25mg Tablets and Phenergan Elixir to suit different preferences.

Critical Safety Warnings

Never exceed 100mg in 24 hours. Phenergan causes significant drowsiness - avoid driving, operating machinery, or consuming alcohol. Do not give to children under 6 years old. If you experience severe side effects like difficulty breathing, irregular heartbeat, or severe confusion, seek immediate medical attention. Contact NHS 111 or your GP if symptoms persist or worsen.

Common Emergency Situations

For motion sickness, take 25mg the night before travel, then 25mg in the morning of your journey. When treating nausea and vomiting, start with 25mg, then 12.5-25mg every 4-6 hours as needed. For sudden allergic reactions causing itching or hives, 25mg can provide relief, but severe reactions require emergency medical care.

When to Seek Medical Help

Contact healthcare professionals immediately if you experience breathing difficulties, severe dizziness, rapid heartbeat, or signs of allergic reaction to the medication itself. Elderly patients should use lower doses due to increased sensitivity. Always check with your pharmacist about interactions with other medications you're taking.

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Frequently asked questions