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Genric Name: Selenium se-LEE’nee-um se-LEE-nee-um
Names of brands: Selenium TR, Selepen, Sele-Pak
Dosage format: oral tablet (100 mg; 200 mg; 50 mg)
The class of drugs: minerals and electrolytes

What is Selenium?

Selenium is a mineral present in soil and occurs naturally in certain food items (such as whole grains, Brazil almonds, sunflower seeds, seafood, and more). Selenium isn't produced by the body but is essential for thyroid health and immune system functioning.Selenium can be utilized to prevent or treat selenium deficiency.Selenium is used in alternative medicine to aid in treating Hashimoto's thyroiditis (an auto-immune disorder that affects the thyroid) as well as for treating high levels of cholesterol.

Not all uses of selenium have been endorsed by the FDA. Selenium shouldn't be used in lieu of medications prescribed by your doctor.Selenium is also used for other purposes that are not covered in this product's guide.

Side effects of Selenium

Contact a medical professional immediately. If you notice any of the following symptoms that indicate an allergic reaction, symptoms of hives: difficulty breathing and swelling of your lips, face, or tongue.

The long-term use of high doses of selenium could cause dangerous adverse effects. Stop taking selenium immediately and consult your physician immediately in case you experience:

  • Nausea, vomiting;
  • Low energy, and feeling tired or irritable. Exhausted
  • Hair loss, mild itching and painful fingernails, or white streaks appearing on nails;
  • Feeling lightheaded; tremors;
  • Muscle tenderness;
  • Flushing (warmth or redness, or a tingly sensation);
  • Metallic taste or bad breath, a bad body odor,
  • Bleeding or easy bruising.

This isn't a complete list of possible side effects, and other effects may also be present. Contact your physician for advice regarding medical effects. You can report symptoms to the FDA at 1-800-FDA-1088.


The use of high doses or for long periods of selenium could cause grave health problems or even death. Use less of this product than suggested on the product's label.

Follow the directions on the label of your medication and on the label of your package. Be sure to inform your health care providers about your medical issues, allergies, and the medicines you are taking.

Prior to use this drug

This product is for those who have an allergy to selenium.Selenium taken long-term or in high doses can increase the risk of developing diabetes or other medical ailments. Talk to your physician about the specific risk that you face.

Before taking selenium, speak to your physician. The dosage requirements for you may differ depending on whether you have:

  • Chronic kidney disorder (or in the case of taking dialysis);
  • Thyroid that is underactive
  • Skin cancer.

Your dosage needs could differ when you are pregnant or breastfeeding. Do not take this medication without medical advice if you are breastfeeding or pregnant.

Don't give health or herbal supplements to your child unless you have medical guidance.

How to take Selenium?

When you're considering the use of herbal supplements, make sure you seek the advice of your physician. You might also think about consulting someone who is certified in the use of herbal or health supplements. If you decide to take selenium, do so as stated on the label or as recommended by your pharmacist, doctor, or any other health professional.The long-term use of selenium in doses higher than 400 milligrams (mcg) daily can result in serious medical issues or even death. Don't take more of this supplement than indicated in the package.

The recommended allowance for dietary selenium rises as you get older. Follow the advice of your doctor. You can also refer to the National Academy of Sciences "Dietary Reference Intake" or the U.S. Department of Agriculture's "Dietary Reference Intake" (formerly "Recommended Daily Allowances" or RDA) listing for more details.

If you require surgery, be sure to inform your surgeon in advance that you're taking selenium. It is possible that you will have to discontinue using this drug for a minimum of two weeks prior to the surgery.The medication may influence the results of specific medical tests. Inform any physician who treats patients that you're using selenium.Place it in a cool, dry place far from heat and moisture.

What happens if I miss the dose?

You should take the missed dose as quickly as you can remember. Don't miss your missed dosage if it's nearing the time for the next dose. Don't take any selenium to make up for the missed dose.

What happens if I overdose?

For medical emergencies, seek emergency treatment or contact the Poison Help Line at 1-800-222-1222. A selenium-related overdose could be fatal.

What should be avoided?

Follow the instructions of your physician regarding any limitations on foods, drinks, or any activity.

Interaction with other drugs

Other medications can affect selenium, which includes medications that are prescribed and available over the counter, vitamins, and herbal products. Be sure to inform your health professionals about any medications you take currently and all medicines that you decide to stop or modify your use of.