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selenase® Frequently Asked Questions

Who should not use selenase® oral liquid?

Do not use selenase® oral liquid if you:

  • Are allergic to sodium selenite pentahydrate or any of the other ingredients found in this medicine (i.e. sodium chloride, hydrochloric acid, and water for injections)
  • Have a selenosis (selenium poisoning)

Why can’t I get selenium from my diet? 

Selenium is indeed found in many foods, including meat, fish, dairy, and even supplemental yeast products. However, the problem with these dietary sources is that they contain selenium in its organic form: selenomethionine, which is inefficiently absorbed. This can then result in the unwanted accumulation of selenium in unnecessary places of the body.

 Also, it's worth noting that studies have found the consumption of just 1 Brazil nut a day to increase selenium levels far beyond the recommended range. This, therefore, signifies that the general recommendation to eat 2 Brazil nuts a day can lead to an overdose of selenium in the long-term, which can lead to kidney and heart problems – and even death.

What are some of the possible side effects of selenase® oral liquid?

If you use more selenase® oral liquid than you should, the following symptoms may occur:

Acute (short-term)

  • Garlic odor on the breath 
  • Tiredness
  • Nausea 
  • Diarrhea
  • Abdominal pain

Chronic (long-term)

  • Abnormal growth of nails and hair 
  • Peripheral polyneuropathy (a disorder of a nerve or nervous pathway that may be associated with numbness or tingling)

What if I miss a dose of selenase® oral liquid?

Do not take extra doses of selenase® oral liquid to make up for a missed dose. 

What should I tell my doctor before taking selenase® oral liquid?

Tell your healthcare provider about all the medicines you take, including prescription and over-the-counter medicines, vitamins, and herbal supplements.

What should I know if I am pregnant or plan to become pregnant?

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


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


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


There is no data available regarding selenase® oral liquid’s effect on fertility,

How should I store selenase® oral liquid?

  • Keep this medicine out of sight and reach of children.
  • Store in a cool, dry place and away from direct sunlight.
  • Do not use selenase® oral liquid after the expiry date, which is stated on the label on the ampoule or the drinking bottle and the carton after "EXP". The expiry date refers to the last day of that month. 
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