Tamiflu, oseltamivir phosphate, is an antiviral medication prescribed to combat influenza A and B viruses. It works by inhibiting the neuraminidase enzyme, a protein that helps the virus spread and release new particles from infected cells. This prevents the virus from multiplying, allowing the immune system to fight the infection. Dizziness, often described as lightheadedness, unsteadiness, or feeling faint, is a potential experience for individuals taking this medication.
Is Dizziness a Side Effect?
Dizziness is a reported side effect of Tamiflu. Clinical trials and post-marketing surveillance have identified dizziness as a possible reaction. It is recognized as a less frequent side effect compared to others.
Reports indicate that dizziness occurs in a small percentage of users, affecting between 1% to 10% of individuals in some studies, with one analysis noting it was mentioned by about 8.0% of reviewers. This dizziness is typically mild and transient, meaning it usually does not last long. The precise biological mechanism causing dizziness from Tamiflu is not fully understood, but it remains a known potential effect.
Other Common Side Effects
Beyond dizziness, Tamiflu is associated with other common, generally mild side effects. Nausea and vomiting are frequently reported, with nausea affecting up to 10% of people aged 13 and older in clinical trials. Taking the medication with food can often mitigate these gastrointestinal disturbances.
Headaches are another common side effect, though headaches are also a prevalent symptom of the flu. Diarrhea is also reported, particularly in infants. These common side effects are often temporary, appearing early in the course of treatment and resolving within a day or two. Other less frequent but reported common side effects include general pain, abdominal pain, and insomnia.
When to Seek Medical Advice
Contact a healthcare professional if any side effects become severe, persistent, or are accompanied by other concerning symptoms. For instance, if dizziness is intense or does not subside, or if it occurs alongside confusion, a severe headache, or difficulty breathing, seek medical advice.
Signs of a serious allergic reaction, such as a rash, itching, hives, swelling of the face, lips, tongue, or throat, or wheezing, require immediate medical attention. Rare but severe skin reactions, including erythema multiforme, Stevens-Johnson Syndrome, and toxic epidermal necrolysis, can manifest as a rash, blistering, or peeling skin and necessitate urgent medical care.
Behavioral changes, such as confusion, agitation, hallucinations, or seizures, particularly in children and adolescents, should also be reported to a doctor promptly. Do not discontinue the medication without first consulting your healthcare provider, and any concerning effects should be communicated to ensure proper guidance and management.