Some multivitamins may affect other medical conditions or treatments. Do not start taking a multivitamin without first talking to your doctor if you have any health problems or conditions, or if you take other prescription or over-the-counter medications.
Multivitamins are generally considered to be safe for use during pregnancy and breast-feeding. Special prenatal vitamins are available and are important for the healthy development of a baby. However, large doses of some vitamins can be harmful. Talk to your doctor about taking a vitamin and mineral supplement during pregnancy or breast-feeding.
Take multivitamins exactly as directed by your doctor. If you do not understand these directions, ask your pharmacist, nurse, or doctor to explain them to you.
Take each dose with a full glass of water.
Take multivitamins with food to lessen stomach upset.
Some multivitamins are available in a chewable tablet formulation. Chew these tablets thoroughly before swallowing.
Some multivitamins are also available in liquid form. To ensure that you get the correct dosage, measure liquid multivitamins with a dose-measuring spoon or cup, not a regular table spoon. If you do not have a dose-measuring device, ask your pharmacist where you can get one.
Do not take more of a multivitamin than is prescribed for you or is directed on the package. Large doses of multivitamins can be dangerous.
Store multivitamins at room temperature away from moisture and heat.
Take the missed dose as soon as you remember. However, if it is almost time for your next dose, skip the missed dose and take only the next regularly scheduled dose. Do not take a double dose.
Stop taking multivitamins and seek emergency medical attention if you experience an allergic reaction (difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or hives).
Other, less serious side effects may be more likely to occur. Nausea, constipation, black stools, and diarrhea are among the most common. Taking multivitamins with food may decrease these side effects.
Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome.
Do not take more of a multivitamin than is prescribed for you or is directed on the package. Large doses of multivitamins can be dangerous.
There are no restrictions on food, beverages, or activities while you are taking multivitamin supplements. Follow any special instructions your doctor gives you.
Before taking a multivitamin, tell your doctor if you are taking any other prescription or over-the-counter medicines. You may not be able to take the multivitamin, or you may require a dosage adjustment or special monitoring if you are taking any other medicines.
Seek emergency medical attention.
Most commonly, symptoms of a multivitamin overdose include nausea and vomiting.