The Food and Drug Administration (FDA) labels Tamiflu as pregnancy category C. This means that a pregnant woman should only take Tamiflu if the benefit outweighs the potential risk to the. Relenza and Tamiflu are both FDA approved for treatment of influenza. Both drugs have been carefully looked at to understand their safety profile in pregnancy and we are continuing to monitor them. However, when each study was evaluated separately, all had inadequate sample sizes and some lacked dosing information, preventing definitive assessment of risk. Pregnant women have higher risk of severe complications from influenza, which may lead to adverse pregnancy and/or fetal outcomes. A total of 859 pediatric subjects received treatment with TAMIFLU for oral suspension either at a 2 mg per kg twice daily for 5 days or weight-band dosing. Vomiting was the only adverse reaction reported at a frequency of ≥1% in subjects receiving TAMIFLU (16%) compared to placebo (8%). Medscape - Influenza-specific dosing for Tamiflu (oseltamivir), frequency-based adverse effects, comprehensive interactions, contraindications, pregnancy & lactation schedules, and cost information. Adults and Adolescents (13 years of age and older) The recommended oral dosage of TAMIFLU for treatment of influenza in adults and adolescents 13 years and older is 75 mg twice daily (one 75 mg capsule or 12.5 mL of oral suspension twice daily) for 5 days. Adults and Adolescents The recommended oral dose of TAMIFLU for prophylaxis of influenza in adults and adolescents 13 years and older following close contact with an infected individual is 75 mg once daily for at least 10 days. How to use Tamiflu. Read the Patient Information Leaflet if available from your pharmacist before you start taking this medicine. If you have any questions, consult your doctor or pharmacist. Find out why it’s considered safe to take Tamiflu or other antivirals during pregnancy to prevent serious complications from the flu and how these medications can help you. The flu shot is made from an inactivated virus, so it's safe for both mother and baby during any stage of pregnancy. The nasal spray vaccine is made from a live virus, and isn't recommended for use during pregnancy.