Periactin 4mg Anti-Histamine Tablets (30 Tablets)


  • Relieves Common Allergy Symptoms
  • Active Ingredient: Cyproheptadine
  • Buy With Confidence From UK Registered Pharmacy
  • Includes Free Prescription

An allergy is when the body has a reaction to a particular food or substance, affecting more than 1 in 4 people in the UK at some point in their lives. Cetirizne is an antihistamine medicine which is a popular treatment for allergies.

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Product Description

What Are Periactin 4mg Anti-Histamine Tablets and What Are They Used For

Periactin 4mg Anti-Histamine Tablets are used to relieve and treat allergy symptoms they tablets contains medicine called Cyproheptadine. This belongs to a group of medicines called antihistamines. In some illnesses too much histamine and serotonin are produced in the body. These occur naturally in your body. Periactin helps in these illnesses by stopping the unwanted effects of histamine and serotonin.

It can be used for the following:

  • Skin allergies with itchiness, swelling, or red skin, eczema or nettle rash
  • Itchiness of chicken pox and reactions to insect bites and stings
  • Sneezing, watery eyes and blocked or runny nose caused by an allergy (allergic rhinitis)
  • Conjunctivis caused by an allergy – with red, watery, inflamed eyes


How To Take Periactin 4mg Anti-Histamine Tablets

  • Adults and children over 14 years: Take ONE tablet three times a day (Do not exceed the Max dose 8 tablets a day)
  • Children aged 7-14 years: ONE tablet two or three times a day as needed (Do not give more than 4 tablets a day)
  • Children aged 2-6 years:Half a tablet two or three times a day (Do not give more than 3 tablets a day)

Periactin is not suitable for children two year or under.

When Not To Take Periactin 4mg Anti-Histamine Tablets

Do not take Periactin if:

  • You are allergic (hypersensitive) to cyproheptadine or any of the other ingredients of Periactin.
  • You are taking a type of medicine called a monoamine oxidase inhibitor (MAOI) for depression, such as meclobemide, phenelzine, tranylcypramine, linezolid or pargyline.
  • You have a narrowing of the opening from the stomach (‘stricture’)
  • You have an eye problem called ‘glaucoma’
  • You are being treated for an asthmatic attack
  • You are elderly and not very mobile
  • You have problems passing urine
  • You have a stomach ulcer.
  • You have rare hereditary problems of galactose intolerance, the Lapp lactase deficiency or glucose-galactose malabsorption.
  • You wish to use Periactin to treat lower respiratory tract symptoms, including those of acute asthma.

Consult your doctor or pharmacist before taking Periactin if:

  • You are pregnant or breastfeeding.
  • You are taking MAO inhibitors, alcohol or CNS depressants (e.g. hypnotics, sedatives, tranquillisers and antianxiety agents), medicines for anxiety (e.g . diazepam, alprazolam).
  • Drugs with anti-serotonin activity, such as cyproheptadine.
  • You have a history of bronchial asthma, increased intraocular pressure, hyperthyroidism, cardiovascular disease, or hypertension.
  • You wish to engage in activities requiring motor coordination and mental alertness, such as driving a car or operating machinery.
  • You have high blood pressure or heart problems.
  • You have been told by your doctor that you cannot tolerate or digest some sugars (have an intolerance to some sugars).

Periactin 4mg anti-Histamine Tablet Ingredients

  • The active substance is cyproheptadine hydrochloride. Each Periactin tablet contains 4 mg anhydrous cyproheptadine hydrochloride.
  • The other ingredients are calcium hydrogen phosphate E341, lactose, magnesium stearate E572, potato starch, pregelatinised maize starch.

See our full allergy treatment range here.

Read more about allergies. 

Side Effects

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Stop using cyproheptadine and call your doctor at once if you have:

a light-headed feeling, like you might pass out;

tremor, seizure (convulsions);

confusion, hallucinations;

little or no urination;

fast or pounding heartbeats;

easy bruising or bleeding;

ringing in your ears; or

pale or yellowed skin, dark colored urine, fever, weakness.

Common side effects may include:

drowsiness, dizziness;

dry mouth, nose, or throat;


blurred vision; or

feeling restless or excited (especially in children).

Further Information