FluMist Side Effects

FluMist is a vaccine to prevent seasonal influenza. It always contains a small amount of three weakened viruses, the ones that scientists have determined to be the most likely to spread during the current flu season. This vaccine is administered into the nostril. According to the drug manufacturer, FluMist is not indicated for children under 2 or adults over 49. Like all vaccines, FluMist carries the risk of side effects.

Runny Nose

The "2010 Lippincott's Nursing Drug Guide" reports that one of the most common side effects of FluMist is runny nose. Similar effects include a stuffy nose, cough and sore throat due to mucus drainage. Congestion can be treated with a mild decongestant and a sore throat usually responds to acetaminophen. Children administered the vaccine may develop a wheeze; this is more likely in children who have a chronic condition that causes wheezing. Contact the child's physician for guidance if wheezing occurs and seek emergency treatment if breathing becomes difficult.

Headache

Headache are another common side effect of the vaccine. Some patients experience body aches for several days after administration of FluMist. These effects can be treated with acetaminophen.

Fever

Some people receiving the vaccine will develop a fever of 100 to 102 degrees. Others will have a milder fever. This usually lasts for less than a week and can be treated with acetaminophen.

Stomachache

Some patients complain of stomachache due to FluMist. It may cause a loss of appetite as well. Occasionally, a patient will have one or more episodes of vomiting. These side effects usually resolve without treatment.

Fatigue

Adults may feel fatigued for several days after taking the vaccine. Children may have a lower activity level and seem cranky or fussy. These adverse effects usually lessen with a day or two of rest.

Allergic Reaction

It is possible to have an allergic or hypersensitive reaction to any component in the vaccine. The Centers for Disease Control and Prevention explains that this reaction may manifest as hives, pale skin, wheezing, difficulty breathing, dizziness or rapid heart rate. Immediate medical care should be sought for a severe allergic or hypersensitive reaction.