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Multivitamin Side Effects

Medically reviewed by Drugs.com. Last updated on Apr 8, 2022.

Applies to multivitamin: oral capsule, oral liquid, oral tablet, oral tablet disintegrating

Other dosage forms:

Warning

If your product has iron in it:
  • Accidental overdose of drugs that have iron in them is a leading cause of deadly poisoning in children younger than 6 years of age. Keep away from children. If this drug is taken by accident, call a doctor or poison control center right away.

What are some side effects that I need to call my doctor about right away?

WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:

All products:

  • Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing, swallowing, or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.

If your product has iron in it:

  • Black, tarry, or bloody stools.
  • Fever.
  • Very upset stomach or throwing up.
  • Very bad belly pain.
  • Throwing up blood or throw up that looks like coffee grounds.
  • Stomach cramps.

What are some other side effects of this drug?

All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:

All products:

  • Upset stomach or throwing up.

If your product has iron in it:

  • Constipation.
  • Change in color of stool to green.
  • Diarrhea.
  • Belly pain.

These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.

You may report side effects to the FDA at 1-800-332-1088. You may also report side effects at https://www.fda.gov/medwatch.

Frequently asked questions

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.

Medical Disclaimer