Zanamivir, marketed under the brand name Relenza, is an antiviral medication that blocks the impact a virus can have on the body, as indicated by Drugs.com. The medication is prescribed for the treatment of flu symptoms in individuals who have had symptoms for fewer than two days. Zanamivir, according to Drugs.com, comes in a powder form that is inhaled to reduce fever, chills, muscle aches, sore throat, runny nose and/or congestion. As with any medication zanamivir has the potential for side effects.
Serious Side Effects
EMedTV.com notes the following serious side effects may occur with the use of zanamivir: trouble breathing, wheezing, seizures, abnormal behavior, heartbeat irregularities and/or fainting.
Common Side Effects
The most common side effects, as indicated by eMedTV.com, may include fever, chills, sinus infection, ear infection, throat infection, nose infection, dizziness and/or joint pain or problems. Drugs.com suggests other mild effects, including headache, nausea, vomiting, diarrhea, stuffy or irritated nose and/or coughing, may occur in those who have taken zanamivir.
Allergic Reaction
Some individuals may experience a sensitivity or allergy to zanamivir. Drugs.com describes these serious, and potentially fatal, symptoms as hives, unexplained rash, difficulty breathing and unexplained swelling of the face and/or mouth. Severe allergy can lead to anaphylactic shock, which occurs when the blood pressure drops drastically and the individual struggles to breathe.
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