What is a Patient Information Leaflet and why is it useful?

The Patient Information Leaflet (PIL) is the leaflet included in the pack with a medicine. It is written for patients and gives information about taking or using a medicine. It is possible that the leaflet in your medicine pack may differ from this version because it may have been updated since your medicine was packaged.

Below is a text only representation of the Patient Information Leaflet. The original leaflet can be viewed using the link above.

The text only version may be available in large print, Braille or audio CD. For further information call emc accessibility on 0800 198 5000. The product code(s) for this leaflet is: PL02855/0070.

Nytol One-A-Night

Package leaflet: Information for the user


One-a-Night 50mg Tablets

Diphenhydramine Hydrochloride

Read all of this leaflet before you start taking this medicine because it contains important information for you. Always take this medicine exactly as described in this leaflet or as your doctor or pharmacist has told you.

  • Keep this leaflet, you may need to read it again.
  • Ask your pharmacist if you need more information or advice.
  • If you get any side effects, talk to your doctor or pharmacist. This includes any possible side effects not listed in this leaflet. See section 4.
  • You must talk to a doctor if you do not feel better or if you feel worse.

In this leaflet:

1.What Nytol One-A-Night is and what it is used for
2.What you need to know before you take Nytol One-A-Night
3.How to take Nytol One-A-Night
4.Possible side effects
5.How to store Nytol One-A-Night
6.Contents of the pack and other information

1. What Nytol One-A-Night is and what it is used for

Nytol One-A-Night is used to relieve temporary sleeping difficulties.

The active ingredient is diphenhydramine hydrochloride, an antihistamine that causes sleepiness or drowsiness. Temporary difficulties in getting a good night’s sleep can be caused by various problems such as stress, jet lag or personal problems such as bereavement. In sleep problems of this type, Nytol One-A-Night has been shown to help sufferers to fall asleep faster, have a longer and deeper sleep, and to wake up feeling rested in the morning.

Do not take Nytol One-A-Night for more than 2 weeks without consulting your doctor.

2. What you need to know before you take Nytol One-A-Night

Do not take Nytol One-A-Night:

  • if you have ever had an allergic reaction to diphenhydramine hydrochloride or any of the other ingredients (listed in Section 6)
  • if you have an obstruction in your stomach or gut (for example, because of an ulcer).

Warnings and precautions

Talk to your doctor or pharmacist before taking Nytol One-A-Night:

  • if you have asthma, bronchitis or Chronic Obstructive Pulmonary Disease (COPD)
  • if you have narrow-angle glaucoma (a form of raised pressure in the eye)
  • if you have an enlarged prostate or urinary retention
  • if you have moderate to severe liver or kidney disease
  • if you have myasthenia gravis, epilepsy or seizure disorders.
  • If your sleeping difficulties persist, talk to your doctor or pharmacist.
  • Nytol One-A-Night may get less effective if you use it continuously.

Other medicines and Nytol One-A-Night

Talk to your doctor or pharmacist before taking these tablets if you are taking any prescribed medicines; particularly tricyclic antidepressants, monoamine oxidase inhibitors (MAOIs prescribed for depression) within the last two weeks, atropine (used to dilate pupils of the eyes) or medicines which make you drowsy. Avoid the use of other antihistamines including those used on your skin and in cold and cough medicines, while taking this medicine.

Nytol One-A-Night with food, drink and alcohol

Do not drink alcohol while using Nytol One-A-Night.

Pregnancy, breast feeding and fertility

Talk to your doctor before taking Nytol One-A-Night if you are pregnant, trying to become pregnant, or breast feeding.

Driving and using machines

Do not drive or operate machinery.

Nytol One-A-Night is intended to produce sleepiness or drowsiness soon after the dose is taken.

Nytol One-A-Night contains lactose

If you have been told by your doctor that you have an intolerance to some sugars, ask your doctor before taking this medicine.

3. How to take Nytol One-A-Night

Always take this medicine exactly as described in this leaflet or as your doctor or pharmacist has told you. Check with your doctor or pharmacist if you are not sure.

The recommended dose for adults and children aged 16 years and over: Swallow 1 tablet with water 20 minutes before you go to bed.

Not to be used by children under 16 years.

Not to be used by the elderly with confusion.

  • Do not take more than the recommended dose.
  • Do not take extra tablets if you wake up in the night.
  • Do not take for more than 2 weeks without consulting a doctor.

If you take more Nytol One-A-Night than you should

Contact your doctor or casualty department.

If you forget to take Nytol One-A-Night

Do not take a double dose to make up for a forgotten dose. Take the next dose at the usual time as described in this leaflet.

If you have any further questions on the use of this medicine, ask your doctor or pharmacist.

4. Possible side effects

Like all medicines, Nytol One-A-Night can have side effects, although not everybody gets them.

Common (may affect up to 1 in 10 people)

  • The most common side effects are: tiredness, drowsiness, reduced attention, unsteadiness, dizziness or a dry mouth.

Not known (frequency cannot be estimated from the available data)

  • Allergic reactions (such as rash, shortness of breath and swelling), blurred vision, palpitations (feeling your heart beat) or irregular heartbeat.
  • Muscle twitching, convulsions, headache or pins and needles.
  • Also nausea (feeling sick), vomiting (being sick), thicker bronchial mucus and difficulty passing urine.

Reporting of side effects:

If you get any side effects, talk to your doctor, pharmacist or nurse. This includes any possible side effects not listed in this leaflet. You can also report side effects directly via the Yellow Card Scheme at: www.mhra.gov.uk/yellowcard

By reporting side effects you can help provide more information on the safety of this medicine.

5. How to store Nytol One-A-Night

Keep this medicine out of the sight and reach of children.

Do not use this medicine after the expiry date (EXP) stated on the pack.

Do not throw away any medicines via wastewater or household waste. Ask your pharmacist how to throw away medicines you no longer use. These measures will help protect the environment.

Store in a dry place.

6. Contents of the pack and other information

What Nytol One-A-Night contains

  • The active substance: Each tablet contains Diphenhydramine Hydrochloride 50 mg.
  • The other ingredients are: Anhydrous lactose, microcrystalline cellulose, maize starch, stearic acid and silicon dioxide.

What Nytol One-A-Night looks like and contents of the pack

Packs of Nytol One-A-Night contain 4, 8, 10, 16 or 20 tablets. Not all pack sizes may be marketed.

Marketing authorisation holder is

Omega Pharma Ltd.
32 Vauxhall Bridge Road
United Kingdom

and all enquiries should be sent to this address.


Wrafton Laboratories Ltd
North Devon
EX33 2DL

This leaflet was last revised in February 2017.