You are concerned that nausea may be a side effect of tamiflu, but you cannot just give tamiflu to patients with the flu and say that nausea is a side effect if people become nauseous. This is because nausea is common for people who have the flu. From past studies you know that about 35
1) Nausea is a side effect of tamiflu.
2) Nausea is not a side effect of tamiflu.
3) Tamiflu causes the flu.
4) Tamiflu does not cause the flu.