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Nytol One-A-Night 50mg - 20 Tablets

Nytol One-A-Night 50mg - 20 Tablets

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  • ✔️ Contains 50mg diphenhydramine hydrochloride per tablet for effective sleep onset
  • ✔️ Single tablet dose — no need to take multiple tablets at bedtime
  • ✔️ Helps you fall asleep within 20–30 minutes of taking
  • ✔️ Suitable for adults and adolescents aged 16 and over
  • ✔️ Licensed UK over-the-counter sleep aid for short-term insomnia relief

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Is Nytol One-A-Night 50mg Right for You?

 

Struggling to fall asleep is something most people experience at some point. Whether it's stress, a change in routine, or simply an overactive mind at bedtime, short-term sleep disturbance can leave you feeling exhausted and frustrated. Nytol One-A-Night 50mg is a clinically established, over-the-counter sleep aid designed specifically for adults who need temporary help drifting off. Each pack contains 20 tablets, priced at just £6.99, making it an accessible option for those occasional sleepless nights. You can browse our full range of sleep aid products if you'd like to compare your options before deciding.

The active ingredient is diphenhydramine hydrochloride 50mg — a sedating antihistamine with a well-documented history of use in short-term insomnia. It's licensed in the UK as a pharmacy (P) medicine, meaning it can be sold without a prescription but should be used with care and only as directed.

 

How Does Nytol One-A-Night 50mg Work?

 

Diphenhydramine works by blocking histamine H1 receptors in the central nervous system. Histamine is a chemical that plays a role in keeping you awake and alert. By blocking its action in the brain, diphenhydramine produces a sedative effect that helps you fall asleep more easily. Here's a simplified breakdown of the mechanism:

  • Diphenhydramine crosses the blood-brain barrier after oral ingestion.
  • It binds to and blocks H1 histamine receptors in the brain.
  • This reduces neuronal excitability, promoting drowsiness.
  • Onset of action typically occurs within 20–30 minutes of taking the tablet.
  • The sedative effect generally lasts for around six to eight hours.

It's worth noting that diphenhydramine also has anticholinergic properties, which accounts for some of its side effects such as dry mouth and blurred vision. These effects are usually mild and temporary.

 

Who Should Consider Using Nytol One-A-Night 50mg?

 

This product is intended for adults aged 16 and over who are experiencing temporary difficulty sleeping. It's particularly suited to people whose sleep problems are linked to a specific, identifiable cause — such as a period of stress, travel disruption, or a change in shift patterns. It is not intended as a long-term solution.

  • Adults aged 16 and over with short-term insomnia
  • People who find it difficult to fall asleep rather than stay asleep
  • Those who prefer a single-tablet, once-nightly dosing format
  • Individuals who have not responded adequately to lower-strength options such as Nytol Original 25mg

 

How Does Nytol One-A-Night 50mg Compare to Nytol Original 25mg?

 

Feature Nytol One-A-Night 50mg Nytol Original 25mg
Active ingredient Diphenhydramine HCl 50mg Diphenhydramine HCl 25mg
Tablets per dose 1 tablet 2 tablets
Suitable for Adults 16+ Adults 16+
UK classification Pharmacy (P) medicine Pharmacy (P) medicine

 

How Should You Store Nytol One-A-Night 50mg and Is It Clinically Suitable for You?

 

Store Nytol One-A-Night 50mg below 25°C in a dry place, away from direct sunlight. Keep it out of the reach and sight of children. Do not use the product after the expiry date printed on the packaging. If you're unsure whether this medicine is appropriate for your situation — for example, if you take other medicines regularly or have an existing health condition — it's always worth speaking to a pharmacist first. If you're also managing other health concerns alongside sleep difficulties, you might find it helpful to explore our vitamins and supplements range, which includes products that support general wellbeing.

This product is a medicine. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.

Nytol One-A-Night 50mg - 20 Tablets specifications
Treatment category Short-term insomnia / Sleep disturbance
Active ingredient Diphenhydramine hydrochloride 50mg
Mechanism of action Sedating antihistamine — H1 receptor antagonist
Drug class Antihistamine (sedating)
Route of administration Oral
Preparation Film-coated tablet
Strengths 50mg
Pack sizes 20 tablets
UK classification Pharmacy (P) medicine
Suitable for Adults and adolescents aged 16 and over
Effective Short-term relief of sleep disturbance

Specifications of Nytol One-A-Night 50mg - 20 Tablets

 

What Is Nytol One-A-Night 50mg and What Is It Used For?

 

Nytol One-A-Night 50mg is an over-the-counter sleep aid containing diphenhydramine hydrochloride, a sedating antihistamine. It is used for the short-term relief of temporary sleep disturbance in adults and adolescents aged 16 and over. This medicine is not intended to treat chronic or long-standing insomnia — if your sleep problems have persisted for more than two weeks, you should consult your GP rather than continuing to use this product.

 

What Do You Need to Know Before Using Nytol One-A-Night 50mg?

 

Before taking this medicine, read the following carefully. There are certain situations where Nytol One-A-Night 50mg should not be used.

Do not take this medicine if you:

  • Are under 16 years of age
  • Are pregnant or breastfeeding
  • Have closed-angle glaucoma
  • Have an enlarged prostate or difficulty passing urine
  • Have severe liver disease
  • Are allergic to diphenhydramine or any other ingredient in the product
  • Are taking monoamine oxidase inhibitors (MAOIs) or have taken them within the last 14 days
  • Have epilepsy or a history of seizures

Known drug interactions — take care if you are also taking:

  • Other sedatives, hypnotics, or anxiolytics (e.g. benzodiazepines)
  • Other antihistamines (including those in cold and flu remedies)
  • Tricyclic antidepressants
  • Alcohol — this significantly increases sedation and should be avoided entirely
  • Anticholinergic medicines (e.g. certain bladder or stomach medicines)

If you are unsure whether any of your current medicines interact with diphenhydramine, speak to your pharmacist before use. You might also want to check our cold and flu range, as some products in that category contain antihistamines that could interact.

 

How Should You Use Nytol One-A-Night 50mg?

 

Always use this medicine exactly as described in the patient information leaflet. Do not exceed the stated dose.

  1. Take one tablet approximately 20 minutes before you intend to go to sleep.
  2. Swallow the tablet whole with a glass of water.
  3. Do not take more than one tablet in any 24-hour period.
  4. Do not take this medicine for more than two consecutive weeks without seeking medical advice.
  5. Do not drive or operate machinery after taking this medicine — residual drowsiness may persist into the following morning.
Indication Age Group Dose Frequency
Short-term sleep disturbance Adults and adolescents 16+ 1 tablet (50mg) Once nightly, 20 minutes before bed
Short-term sleep disturbance Under 16 Not suitable Not applicable

 

What Are the Possible Side Effects of Nytol One-A-Night 50mg?

 

Like all medicines, Nytol One-A-Night 50mg can cause side effects, although not everyone experiences them. The following lists cover the most commonly reported effects.

Common side effects:

  • Daytime drowsiness or grogginess the morning after
  • Dry mouth
  • Blurred vision
  • Difficulty passing urine
  • Constipation

Less common side effects:

  • Headache
  • Dizziness
  • Nausea
  • Paradoxical excitability (feeling more alert rather than drowsy — more common in older adults and children)
  • Palpitations

If you experience any allergic reaction — such as swelling of the face, lips, or throat, difficulty breathing, or a severe skin rash — stop taking the medicine immediately and seek urgent medical attention. For general pain or discomfort that may be disrupting your sleep, you might also find our pain relief range useful alongside sleep hygiene measures.

 

How Should You Store Nytol One-A-Night 50mg?

 

  • Store below 25°C in a dry place.
  • Keep away from direct sunlight and moisture.
  • Keep out of the sight and reach of children.
  • Do not use after the expiry date printed on the carton.
  • Do not dispose of medicines via wastewater or household waste — return unused tablets to your pharmacy for safe disposal.

Written and reviewed by our qualified team

Your safety and success are our highest priorities. Our medical team rigorously evaluates every product and piece of advice we provide, ensuring you receive only the most effective, science-backed solutions available.

Frequently Asked Questions

Where can I buy Nytol One-A-Night 50mg online in the UK?

You can buy Nytol One-A-Night 50mg directly from Cured Pharmacy, a GPhC-registered online pharmacy. It is available without a prescription for adults aged 16 and over. Simply add it to your basket and complete a short eligibility check at checkout to ensure it is suitable for you.

How does Nytol One-A-Night 50mg work in the body?

Nytol One-A-Night 50mg contains diphenhydramine hydrochloride, a sedating antihistamine that blocks H1 histamine receptors in the brain. This reduces neuronal activity and promotes drowsiness, helping you fall asleep more easily. The effect typically begins within 20 to 30 minutes of taking the tablet.

How do I use Nytol One-A-Night 50mg step by step?

Take one tablet approximately 20 minutes before you plan to go to sleep, swallowing it whole with a glass of water. Do not take more than one tablet in a 24-hour period, and do not use the product for more than two consecutive weeks. Avoid alcohol and driving after taking this medicine.

What is the best time to take Nytol One-A-Night 50mg?

The recommended time to take Nytol One-A-Night 50mg is approximately 20 minutes before your intended bedtime. Taking it earlier in the evening may increase the risk of residual drowsiness the following morning. Always ensure you can allow for a full night's sleep of at least seven to eight hours after taking the tablet.

What are the side effects of Nytol One-A-Night 50mg and how do I manage them?

The most common side effects include daytime drowsiness, dry mouth, blurred vision, and difficulty urinating. Most of these are mild and resolve on their own, but if they persist or are troublesome, stop using the product and speak to your pharmacist. Staying well hydrated can help ease dry mouth symptoms.

Who is eligible to take Nytol One-A-Night 50mg?

Nytol One-A-Night 50mg is suitable for adults and adolescents aged 16 and over who are experiencing short-term sleep disturbance. It is not suitable for pregnant or breastfeeding women, people with glaucoma, an enlarged prostate, severe liver disease, or those taking MAOIs. Always read the full patient information leaflet before use.

What happens if I miss a dose of Nytol One-A-Night 50mg?

If you forget to take your tablet before bed, simply skip that dose and do not take it later in the night, as this could cause excessive drowsiness the following morning. Never double up on doses to compensate for a missed one. Resume your normal routine the following night if needed.

Can I take Nytol One-A-Night 50mg every night?

Nytol One-A-Night 50mg is designed for short-term use only and should not be taken for more than two consecutive weeks without medical advice. Prolonged use can lead to tolerance, meaning the medicine becomes less effective over time. If your sleep problems continue beyond two weeks, please speak to your GP.

Can I drink alcohol while taking Nytol One-A-Night 50mg?

No — you should not drink alcohol while taking Nytol One-A-Night 50mg. Alcohol enhances the sedative effect of diphenhydramine, which can lead to excessive drowsiness, impaired coordination, and in some cases, dangerous respiratory depression. Avoid alcohol entirely on any night you take this medicine.

Is Nytol One-A-Night 50mg safe during pregnancy or breastfeeding?

No, Nytol One-A-Night 50mg is not recommended during pregnancy or breastfeeding. Diphenhydramine can pass into breast milk and may cause sedation in a nursing infant. If you are pregnant or breastfeeding and struggling with sleep, speak to your midwife or GP for safe alternatives.

What are the alternatives to Nytol One-A-Night 50mg?

Alternatives include Nytol Original 25mg tablets (a lower-strength version requiring two tablets per dose), other OTC antihistamine-based sleep aids, or non-pharmacological approaches such as cognitive behavioural therapy for insomnia (CBT-I). You can explore our full sleep aid collection to compare available options.

How long does it take for Nytol One-A-Night 50mg to start working?

Most people begin to feel drowsy within 20 to 30 minutes of taking Nytol One-A-Night 50mg. The sedative effect typically lasts for around six to eight hours, which is why it is important to take it only when you can allow for a full night's sleep. Individual responses may vary.

Can older adults take Nytol One-A-Night 50mg safely?

Older adults should use Nytol One-A-Night 50mg with particular caution. Diphenhydramine's anticholinergic effects — such as confusion, urinary retention, and increased fall risk — are more pronounced in elderly patients. It is strongly advisable for older adults to consult their GP or pharmacist before using this product.

What are the latest studies on diphenhydramine as a sleep aid?

Current clinical guidance, including NHS recommendations, supports diphenhydramine as a short-term option for sleep disturbance but cautions against long-term use due to tolerance and anticholinergic side effects. Research increasingly favours non-pharmacological approaches such as CBT-I as a first-line treatment for chronic insomnia. Speak to your GP if you need longer-term support.

Can I take Nytol One-A-Night 50mg with other medicines?

Nytol One-A-Night 50mg can interact with several medicines, including other antihistamines, sedatives, tricyclic antidepressants, and MAOIs. Some cold and flu remedies also contain antihistamines, so always check labels carefully. If you take any regular prescription medicines, speak to your pharmacist before using this product.

How Should You Use Nytol One-A-Night 50mg?

Using Nytol One-A-Night 50mg correctly is important both for your safety and to get the most benefit from the medicine. Always read the patient information leaflet supplied with your pack before taking this product for the first time.

Follow these steps each time you take the medicine:

What Is the Correct Dose of Nytol One-A-Night 50mg?

The standard recommended dose for adults and adolescents aged 16 and over is one 50mg tablet per night. Do not take more than this — a higher dose will not improve sleep quality and significantly increases the risk of side effects.

The table below summarises the dosing guidance for this product:

When Is the Best Time to Use Nytol One-A-Night 50mg?

Take Nytol One-A-Night 50mg approximately 20 minutes before your planned bedtime. This allows the diphenhydramine to begin working by the time you settle down to sleep. Taking it too early in the evening — for example, straight after dinner — may mean the sedative effect peaks before you are ready for bed, or causes unwanted drowsiness while you are still active.

It is also worth considering your schedule for the following morning. Residual drowsiness can persist for several hours after waking, so avoid taking this medicine if you need to drive, operate machinery, or perform tasks requiring full concentration early the next day.

How Long Can You Use Nytol One-A-Night 50mg For?

Nytol One-A-Night 50mg is intended for short-term use only. You should not take it for more than two consecutive weeks without seeking medical advice. Prolonged use can lead to tolerance — where the medicine becomes progressively less effective — and may mask an underlying sleep disorder that requires proper assessment and treatment.

If your sleep difficulties persist beyond two weeks, or if they return shortly after stopping the medicine, please speak to your GP. They can help identify any underlying causes and discuss longer-term management strategies, including non-pharmacological approaches such as sleep hygiene improvements or cognitive behavioural therapy for insomnia (CBT-I).

Do not exceed the recommended dose. If in doubt, speak to your pharmacist.

Customer Reviews

Based on 8 reviews
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G
Geoff Brown

Good product - excellent service

S
Shirley Davies

VERY OBLIGING, WOULD BUY AGAIN, SWIFT DELIVERY

A
Anonymous

Great service and fast delivery

A
Anonymous

Helping me get.to sleep well

J
James Baldock

Thank you for a very nice delivery as well

What Are the Most Common Side Effects of Nytol One-A-Night 50mg?

Because diphenhydramine is a sedating antihistamine, the most frequently reported side effects are directly related to its sedative and anticholinergic properties. These effects are generally mild and tend to resolve without treatment, but they can be inconvenient — particularly if they carry over into the following day.

  • Daytime drowsiness or grogginess the morning after taking the tablet
  • Dry mouth
  • Blurred vision
  • Difficulty passing urine (urinary hesitancy)
  • Constipation

What Are the Less Common Side Effects of Nytol One-A-Night 50mg?

Some people experience side effects that are less frequently reported but still worth being aware of. If any of the following occur and are persistent or distressing, stop taking the medicine and speak to your pharmacist or GP.

  • Headache
  • Dizziness or light-headedness
  • Nausea or stomach upset
  • Palpitations or a faster-than-normal heartbeat
  • Paradoxical excitability — feeling more alert or restless rather than drowsy (more common in older adults)
  • Difficulty concentrating the following day

What Are the Serious Side Effects of Nytol One-A-Night 50mg?

Serious side effects are rare but can occur. Stop taking Nytol One-A-Night 50mg immediately and seek urgent medical attention if you experience any of the following:

  • Signs of an allergic reaction — swelling of the face, lips, tongue, or throat; difficulty breathing; severe skin rash or hives
  • Severe urinary retention (inability to pass urine at all)
  • Confusion or disorientation, particularly in older adults
  • Seizures

These reactions are uncommon, but they require prompt medical assessment. Do not attempt to manage them at home.

What Should You Do If You Experience Side Effects of Nytol One-A-Night 50mg?

For mild side effects such as dry mouth or morning drowsiness, these often improve as your body adjusts. Staying well hydrated, avoiding alcohol, and ensuring you allow a full night's sleep before waking can all help minimise these effects. If side effects are affecting your daily functioning, stop using the product and seek advice from your pharmacist.

You can also report suspected side effects directly to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk. This helps regulators monitor the safety of medicines in real-world use.

Can Nytol One-A-Night 50mg Interact With Other Medicines?

Yes. Diphenhydramine interacts with a number of medicines, and some combinations can be dangerous. The sedative effect is significantly increased when taken alongside alcohol, other antihistamines, benzodiazepines, tricyclic antidepressants, or other CNS depressants. Taking diphenhydramine with MAOIs is contraindicated and can cause serious adverse effects. Always inform your pharmacist of all medicines you are currently taking — including over-the-counter products — before starting Nytol One-A-Night 50mg.

If you are concerned about any side effects, contact your pharmacist or GP immediately.

Patient Information Leaflet

Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)

Written and reviewed by our qualified team

GPhC Number: 2233073
Tarun Kumar

Reviewed by:

Tarun Kumar

Superintendent/ Clinical Lead

📖 Find out more about our team of medical content authors and how we ensure the accuracy of our content with our content guidelines.

Content last updated: 31 Mar 2025

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