Overview
Phenergan 25mg Tablets are a versatile antihistamine used to treat a range of conditions including allergic reactions, travel sickness, nausea, and insomnia. They contain promethazine hydrochloride, which works by blocking histamine in the body — a chemical responsible for allergy symptoms — while also acting on the brain to reduce nausea and cause drowsiness when required.
Phenergan is commonly used to relieve hay fever, skin allergies, rashes, itching, and hives, as well as to prevent and treat motion sickness, dizziness, nausea, and vomiting. Due to its sedating properties, it can also be used short term to support sleep, particularly when symptoms such as allergies or travel disruption interfere with rest.
Phenergan should be used exactly as directed and is intended for short-term or occasional use.
Directions
- For oral use only.
Swallow tablets with water.
Dosage varies depending on the condition being treated.
Allergy relief (adults):
1 tablet (25mg) once daily, usually at night.
Travel sickness (adults):
1 tablet taken the night before travel, followed by another tablet on the day of travel if required.
Insomnia (adults):
1 tablet at bedtime.
Children:
Dosage depends on age and indication. Always follow the instructions in the patient information leaflet or as advised by a doctor or pharmacist.
Do not exceed the stated dose.
Side Effects
Like all medicines, Phenergan can cause side effects, although not everyone experiences them.
Common side effects may include:
Drowsiness or sleepiness
Dizziness
Dry mouth
Blurred vision
Less common but serious side effects:
Confusion or restlessness (more likely in older adults)
Allergic reactions such as rash, swelling, or breathing difficulties
If you experience severe or persistent side effects, stop taking the medicine and seek medical advice.
Warnings
Do not exceed the recommended dose.
May cause drowsiness — do not drive or operate machinery after taking.
Avoid alcohol while using this medication.
Not suitable for children under 6 years of age.
Do not use if you are allergic to promethazine or other phenothiazines.
Consult a healthcare professional before use if you have asthma, epilepsy, glaucoma, liver problems, or difficulty urinating.
Speak to a doctor or pharmacist before use if you are pregnant or breastfeeding.
Not intended for long-term use unless advised by a healthcare professional.
Ingredients
Active ingredient:
Promethazine hydrochloride 25mg per tablet
FAQ
What is Phenergan used for?
Phenergan is used to treat allergy symptoms, prevent and relieve motion sickness, control nausea and vomiting, and provide short-term sedation when required.
How does Phenergan work?
It blocks histamine to reduce allergy symptoms and also acts on the brain to reduce nausea and cause drowsiness.
How quickly does Phenergan work?
Phenergan usually starts to work within 20–60 minutes, depending on the use.
Can Phenergan help with sleep?
Yes, due to its sedating effect, Phenergan can be used short term to help with sleep when drowsiness is beneficial.
Can I take Phenergan every day?
It is generally intended for short-term or occasional use. Long-term use should only be under medical supervision.
Is Phenergan suitable for children?
Yes, for children aged 6 years and over, but dosing depends on age and the condition being treated. Always follow advice provided in Patient Information Leaflet.
Can I take Phenergan with other medicines?
Phenergan may interact with other medicines, especially sedatives or antidepressants. Check with a pharmacist or doctor before use.
