Phenergan Syrup 100 ml is a prescription antihistamine medicine commonly used in the UK to help manage difficulty sleeping (insomnia), restlessness, and night-time allergies. Containing promethazine hydrochloride, it works by blocking histamine in the body and producing a natural sedative effect, which helps you fall asleep faster and enjoy more restful nights.
This syrup is especially beneficial for people who struggle with:
- Occasional insomnia or sleeplessness
- Restless nights due to allergies or cough
- Difficulty relaxing before bedtime
- Sleep disturbances caused by travel or motion sickness
How Phenergan Syrup 100 ml helps with sleep:
Phenergan has a calming effect on the brain, reducing overactivity in the nervous system. This promotes drowsiness, eases anxiety-related restlessness, and supports longer, uninterrupted sleep. Many patients find it useful as a short-term sleep aid when natural remedies are not effective.
Key Benefits for Sleep Support:
- Promotes natural drowsiness for easier sleep onset
- Helps manage night-time allergy symptoms that disrupt sleep
- Provides relief from restlessness and anxiety before bedtime
- Supports better sleep during travel or time-zone changes
Safety Advice:
- Always use under the supervision of a doctor, as it is prescription-only in the UK
- May cause drowsiness the next day – avoid driving or operating machinery until you know how it affects you
- Do not consume alcohol while taking this medicine, as it increases drowsiness
- Not recommended for long-term use without medical guidance
Storage Instructions:
Keep in a cool, dry place below 25°C. Store away from children and direct sunlight.
FAQs (Sleep Focused)
1. Can Phenergan Syrup 100 ml be used as a sleep aid?
Yes. Due to its sedative effect, Phenergan Syrup 100 ml is sometimes prescribed in the UK for short-term relief of insomnia and difficulty sleeping.
2. How long does Phenergan Syrup take to work for sleep?
It usually starts working within 20–60 minutes, helping you feel drowsy and ready for bed.
3. Is Phenergan Syrup 100 ml available over the counter in the UK?
No, Phenergan Syrup 100 ml is prescription-only medicine in the UK and should only be used under a doctor’s supervision.
4. Can I take Phenergan Syrup every night for sleep?
It is generally recommended for short-term use only. Long-term or frequent use should be discussed with your doctor.
5. Does Phenergan Syrup cause morning drowsiness?
Yes, some people may feel drowsy the next morning. Avoid driving or using machinery until you know how it affects you.
James Walker, Manchester –
Works great for allergies and helps me sleep better. Quick delivery too.