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Selenase® 500 micrograms, oral solution (50 micrograms/ml) – patient leaflet, side effects, dosage

Last updated: · Text from the MHRA, as of · About this document

Medicine status: Prescription only (POM) Details

Medicine strength:
500 micrograms
Contains active substance:

Patient leaflet - Selenase 500 micrograms, oral solution (50 micrograms/ml)

1. WHAT SELENASE® ORAL SOLUTION IS AND WHAT IT IS USED FOR

Selenase® oral solution is a medicinal product which belongs to the group of the mineral supplements. Sodium selenite pentahydrate, the active substance in your oral solution, provides a source of selenium, which is an essential trace element in nutrition to ensure that your metabolism functions efficiently.

Your doctor will have recommended this medicine because tests to measure the selenium levels in your blood have shown that you have a selenium deficiency, which cannot be corrected by selenium intake from food sources.

2. WHAT YOU NEED TO KNOW BEFORE YOU USE SELENASE® ORAL SOLUTION

Do not use Selenase® oral solution

  • if you are allergic to sodium selenite pentahydrate or any of the other ingredients of this medicine (listed in section 6).
  • if you have a selenosis (selenium poisoning).

Warnings and precautions

There are no special warnings or precautions for the use of Selenase® oral solution.

Talk to your doctor, pharmacist or nurse before using Selenase® oral solution.

Other medicines and Selenase® oral solution

Tell your doctor or pharmacist if you are taking/ using, have recently taken/ used or might take/ use any other medicines.

It must be ensured that the solution is not mixed or taken at the same time with reducing substances (e.g. vitamin C).

Selenase® oral solution and vitamin C should be administered at an interval of 4 hours.

Pregnancy, breast-feeding and fertility

If you are pregnant or breast-feeding, think you may be pregnant or are planning to have a baby, ask your doctor or pharmacist for advice before taking this medicine.

Pregnancy:

There are no data from the use of Selenase® oral solution in pregnant women. No adverse effect of sodium selenite on the pregnancy or the unborn child is expected, provided that it is used in case of proven selenium deficiency.

Breast-feeding:

Selenium is excreted into the breast milk. But doses correcting selenium deficiency in breast-feeding women are not expected to exert adverse effects on the breast-feeded infant.

Fertility:

There are no data available regarding the effect on fertility.

Driving and using machines

There is no effect on the ability to drive and use machines.

3. HOW TO USE SELENASE® ORAL SOLUTION

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

Selenase® oral solution is for single use only.

The recommended daily dose is:

100 – 200 micrograms selenium (equivalent to 1 to 2 ampoules Selenase® 100 micrograms, oral solution or 2 – 4 ml Selenase® 500 micrograms, oral solution).

If the results from a blood test show that more selenium is required your doctor can increase the dose up to 500 micrograms selenium (equivalent to 5 ampoules Selenase® 100 micrograms, oral solution or 1 drinking bottle Selenase® 500 micrograms, oral solution).

Use in children and adolescents

If you are a child your doctor will prescribe you a dose of 2 µg/kg body weight per day at therapy onset and a maintenance dose of 1 µg/kg body weight per day.

For measuring your children’s dose of less than 1 ml oral solution place approximately 5 ml oral solution in the measuring cup and draw up the needed volume with the enclosed pipette. For example if you have a 1-year-old child with 10 kg body weight the maintenance dose is 10 µg corresponding to 0.2 ml oral solution.

Samples of your blood will be taken from time to time and used to determine the levels of selenium in your blood in order to monitor the success of your treatment.

In the table below you can find the maximum daily doses for children for a longer time:

Age (years) Tolerable Upper Intake Level (µg selenium/day)

1-3 60

4-6 90

7-10 130

11-14 200

15-17 250

Dosage in patients with renal or hepatic impairment

Your doctor will not prescribe a different dose if you have renal or hepatic impairment.

Method of administration:

Selenase® oral solution is indicated for self-medication.

Selenase® 100 micrograms, oral solution:

Detach a single-dose ampoule from the remainder of the strip of ampoules and open the oral ampoule by twisting the top. Squeeze out the whole content of the ampoule into the mouth.

Selenase® 500 micrograms, oral solution:

You have to make the drinking bottle ready for use before use.

Picture 1:

Turn the screw cap first clockwise down in order to open the drinking bottle with the integrated spike of the screw cap.

Picture 2:

Then turn off the screw cap anti-clockwise.

Picture 3:

If you should take 500 micrograms selenium place the complete contents in the mouth. If your doctor has prescribed you a dose less than 500 micrograms selenium remove the required dose in milliliter by carefully squeezing of the drinking bottle into the enclosed measuring cup with milliliter graduation. Then close the drinking bottle firmly.

Hold the liquid in the mouth for about 30 to 60 seconds before swallowing.

Duration of treatment:

Samples of your blood will be taken from time to time and used to determine the levels of selenium in your blood in order to monitor the success of your treatment. As soon as your selenium levels will be normal your treatment with Selenase® oral solution will be finished.

There is no time limit to the administration of Selenase® oral solution in a supplementary dose (100 micrograms selenium per day is equivalent to 1 ampoule).

If you use more Selenase® oral solution than you should

If you use more Selenase® oral solution than you should the following symptoms may occur:

  • acute (short-term): odour of garlic on the breath, tiredness, nausea, diarrhoea and abdominal pain or
  • chronic (long-term) what can affect the growth of nails and hair and may lead to peripheral polyneuropathy (a disorder of a nerve or nervous pathway that may be associated with numbness or tingling).

If you forget to use Selenase® oral solution

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

If you stop using Selenase® oral solution

There are no special instructions, if you stop using Selenase® oral solution.

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

4. POSSIBLE SIDE EFFECTS

Like all medicines, this medicine can cause side effects, although not everybody gets them.

If Selenase® oral solution is given as directed, unwanted effects, so called side effects, have not been reported. However, if you are given too much, the symptoms listed in the above section may be experienced.

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

Yellow Card Scheme

Website: 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 SELENASE® ORAL SOLUTION

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

Do not store Selenase® oral solution above 25 °C.

  • Selenase® 100 micrograms, oral solution:

    Use Selenase® 100 micrograms, oral solution immediately after opening the ampoules.

  • Selenase® 500 micrograms, oral solution:

    Use Selenase® 500 micrograms, oral solution immediately after opening of the drinking bottle.

Do not use this medicine if you notice the ampoule or the drinking bottle is damaged or if the solution is cloudy.

Discard any unused contents.

Do not use this medicine after the expiry date which is stated on the label on the ampoule or the drinking bottle and on the carton after “EXP”. The expiry date refers to the last day of that month.

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 to protect the environment.

6. CONTENTS OF THE PACK AND OTHER INFORMATION

What Selenase® oral solution contains

The active substance is:

Sodium selenite pentahydrate

The other ingredients are:

Sodium chloride, hydrochloric acid, water for injections

  • Selenase® 100 micrograms, oral solution:

    Each ampoule of 2 ml oral solution contains 100 micrograms selenium in the form of 333 micrograms sodium selenite pentahydrate, corresponding to 50 micrograms/ml.

  • Selenase® 500 micrograms, oral solution:

    Each drinking bottle of 10 ml oral solution contains 500 micrograms selenium in the form of 1,665 micrograms sodium selenite pentahydrate, corresponding to 50 micrograms/ml.

What Selenase® oral solution looks like and contents of the pack

What Selenase® oral solution looks like:

Selenase® oral solution is a clear and colourless solution.

Contents of the pack:

  • Selenase® 100 micrograms, oral solution:

    Ampoules each containing 2 ml of oral solution are made of plastic (LDPE)

    Pack sizes: 10, 20, 50, 60, 90 and 100.

  • Selenase® 500 micrograms, oral solution:

    Drinking bottles of plastic (LDPE) with polypropylene screw cap each containing 10 ml of oral solution, a measuring cup and a dosing pipette.

    Pack sizes: 10, 20 and 50.

Not all pack sizes may be marketed.

Marketing Authorisation Holder and Manufacturer

biosyn Arzneimittel GmbH

Schorndorfer Strasse 32

70734 Fellbach

Germany

Distributed by:

Baxter Healthcare Limited

Caxton Way, Thetford,

Norfolk, IP24 3SE,

United Kingdom

This medicinal product is authorised in the Member States of the EEA under the following names:

NL: selenase drank 100 µg, drank 50 µg/ml

selenase drank 500 µg, drank 50 µg/ml

HU: selesyn 100 microgramm, belsöleges oldat (oral solution)

selesyn 500 microgramm, belsöleges oldat (oral solution)

IE: selesyn 100 micrograms/2 ml, oral solution (50 micrograms/ml)

selesyn 500 micrograms/10 ml, oral solution (50 micrograms/ml)

IT: selesyn 100 mcg soluzione orale

selesyn 500 mcg soluzione orale

PT: selenase solução oral 100 microgramas

selenase solução oral 500 microgramas

SK: selenase perorálny roztok 100 µg, perorálny roztok 50 µg/ml selenase perorálny roztok 500 µg, perorálny roztok 50 µg/ml

UK: selenase 100 micrograms, oral solution (50 micrograms/ml)

selenase 500 micrograms, oral solution (50 micrograms/ml)

This leaflet was last revised in 06/2017.

About this document

Source: MHRA - Medicines and Healthcare products Regulatory Agency (products.mhra.gov.uk) · Marketing authorisation: PL 20437/0002

Last revision stated in the text: June 2017 · MHRA data as of 13 October 2026

Found a mistake? Tell us on the contact page.

The information on this site does not replace the advice of a doctor or pharmacist.

Facts about Selenase 500 micrograms, oral solution (50 micrograms/ml)

Prescription needed? Yes, prescription-only medicine (POM)
Active substance Selenium
Strength 500 micrograms
Pharmaceutical form Clear and colourless solution.
Excipients Sodium chloride, Hydrochloric acid, Water for injections
Is it available? Listed as available (NHS Dictionary of Medicines and Devices – not a record of current supplies)
Shelf life selenase® 500 micrograms, oral solution (50 micrograms/ml)
Unopened: 3 years.
After opening: 2 weeks.
Storage Do not store above 25 °C.
Drug group (ATC) Mineral supplement
Marketing authorisation PL 20437/0002, PL 39972/0015 (first authorised 25 May 2010)
Marketing authorisation holder Kora Corporation Ltd. t/a Kora Healthcare

Sources: the MHRA product information (products.mhra.gov.uk) and the NHS Dictionary of Medicines and Devices (dm+d), release 10.1.0 of 12 October 2026, NHS Business Services Authority. Contains public sector information licensed under the Open Government Licence v3.0.