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Rhelax ®

syrup, OTC medicine

Rhelax ® syrup is a laxative and is traditionally used in constipation. The 1,8-dihydroanthracene derivatives contained in the alder buckthorn bark and roots influence the motor function of the colon, accelerating the intestinal passage and reducing fluid resorption. Laxative effect occurs 6-8 hours after taking the drug.

Instructions of use

Rhelax syrup is a medicine traditionally used in constipation.

How to use Rhelax

Adults: 30 ml (2 tablespoons) before sleep, i.e. 25.4 mg of anthranoid compounds converted into glucofrangulin A.

Young people over 12 years of age: 10-15 ml (2 to 3 teaspoons) before sleep, i.e. 8.5 to 12.7 mg of anthranoid compounds converted into glucofrangulin A.

If you feel the effect of Rhelax is too strong or too weak, consult your doctor.

If you take more Rhelax than recommended

So far, no symptoms of overdose have been observed while using Rhelax.
If you take more than the recommended dose of the drug, consult your doctor or pharmacist immediately.

If you miss a dose

Do not take a double dose to make up for a forgotten dose.

Before you use Rhelax

Do not use Rhelax in case of

  • hypersensitivity the active substance or anyexcipients
  • intestinal obstruction,
  • intestinal atonia,
  • acute and chronicinflammatory bowel disease (including ulcerative colitis disease,  Crohn disease),
  • appendicitis,
  • diarrhea,
  • dehydration and electrolyte disorders
  • abdominal pain of unexplained etiology

Take special care when using Rhelax
Due to the content of 12.4 g of sucrose in one tablespoon of syrup, the drug should not be used by people with diabetes.
When used in patients with haemorrhoidal disease, anal fissures, after anal area surgery and long-term immobilization, it is advisable to consult a physician.
The medicine should be used in constipation when the diet and other non-pharmacological treatment fail.
Do not use without medical advice for longer than 1 -2 weeks. Prolonged use of the preparation may lead to weakening of intestinal peristalsis and disorders of water and electrolyte metabolism. Avoid using during menstruation. In case of sucrose intolerance, consult your doctor before taking this medicine. This medicinal product contains up to 3.5% m/m of ethanol (alcohol), i.e. up to 700 mg of ethanol in one table spoon, which is equivalent to 14 ml of beer or 5.8 ml of wine.

Use of Rhelax syrup in children
It is not recommended to apply to children under 12 years of age.

Pregnancy and breast-feeding
The drug should not be used during pregnancy and breast-feeding.

Driving and using machines
There is no data on the impact on the ability to drive vehicles and use machines.

Taking other medicines
Long-term use of Rhelax may result, as the effect of potassium deficiency, in intensification of digitalis glycosides and anti-arrhythmic drugs action. Potassium losses may increase with the simultaneous intake of diuretics, adrenal cortex steroids and licorice root.

Please tell your doctor or pharmacist if you are taking or have recently taken any other medicines, including the ones obtained without prescription.


Possible undesired effects

Like any medicine, Rhelax can cause side effects. These include rare allergic reactions to the drug components. In individual cases, gastric/duodenal cramps may occur, requiring dose reduction.
If you get other side effects not listed in this leaflet, please tell your doctor or pharmacist.

If you experience other side effects not mentioned in this leaflet, please tell your doctor or pharmacist.

Storage of the drug Rhelax

Store at a temperature not higher than 25 °C.

Keep out of the reach and sight of children.

Do not use Rhelax after the expiry date which is stated on the package.


100 g of syrup contains:

The active substance: 
Liquid extract (1:1) consisting of: the root of rheum (Rhei radice), buckthorn bark (Frangulae cortice), fennel fruit (foeniculi fructu), the fruit of caraway (Carvi fructu) (5/4/0.5/0.5) – 10.0 g
[Extractor: ethanol 50% v/v]

Auxiliary substances:
Sucrose, purified water.

15 ml of syrup (one tablespoon) contains 12.7 mg of anthranoid compounds converted into glucagonfrangulin A.

The syrup contains up to 3.5% m/m ethanol.

Package: 125 g of the preparation.

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