This multi-center, randomized, double-blind, multiple-dose, placebo-controlled, parallel-group study will assess the safety and PK of oseltamivir (Tamiflu) and its carboxylate metabolite, RO0640802 in healthy participants. Participants will be randomized to receive 100 milligrams (mg) oseltamivir, 200 mg oseltamivir, or placebo, all administered intravenously twice daily (BID). The anticipated time on study treatment is 5 days.