One-A-Day vitamins are a daily multivitamin brand that combines vitamins and minerals into a daily pill. The vitamin is intended to increase the amount of essential vitamins and calcium needed on a daily basis. According to Drugs.com, no reported side effects or reactions have been associated with One-A-Day vitamins. If you experience adverse reactions after taking One-A-Day vitamins, call your doctor and report the symptoms. You may have an allergy to one or more of the supplements or to other ingredients used in the supplements.
Vitamin Allergy
As with any supplement or drug, you may experience an allergic reaction while taking One-A-Day vitamins. This is similar to experiencing a food allergy. After ingesting the vitamin, the immune system mistakes certain aspects of the supplement as harmful, according to MayoClinic.com. The body responds by creating antibodies that fight off the supplement. The creation of these antibodies causes certain cells to produce histamine, which leads to common allergy symptoms.
Symptoms
Symptoms of an allergic reaction to One-A-Day vitamins may include stuffy nose, sneezing, nasal congestion, wheezing, asthma, headaches, fatigue, hives, eczema, digestive complications and a runny nose, according to Health Tree. Most symptoms will appear within a few minutes after ingesting the supplement and will last for however long the supplement remains in the body.
Severe Allergic Reaction
A severe allergic reaction may occur after taking One-A-Day vitamins. Many times, the severe allergic reaction will not transpire the first time you take the supplement. It may take a few doses before your immune system builds up enough of a defense to cause anaphylactic shock, which is an allergic reaction that sends your entire body into a state of shock. The condition is life-threatening and needs emergency medical attention, according to Drugs.com. Symptoms can include difficulty breathing, swelling of the mouth or throat and rapid heartbeat.
Considerations
Talk with your doctor about taking One-A-Day vitamins for a proper assessment of any possible reactions related to drug interactions. If you are pregnant, could become pregnant or are currently breast feeding, talk with your doctor. Do not take One-A-Day vitamins if you have known allergies to certain foods, medications or other substances. One-A-Day vitamins are not recommended for people who have kidney stones, unusual tumors, excessive amounts of calcium in their urine or are dehydrated, according to Drugs.com.
Warning
You may experience adverse reactions if you overdose on One-A-Day vitamins. Take as directed and do not take more than the recommended daily dosage listed on the label. If you accidentally overdose, you may experience vomiting, diarrhea and severe stomach cramping. Call 911 or go to the nearest emergency room immediately.



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