My 14month old took tamiflu (oseltamivir) 30mg 4times2/day2days.initially treat flua&b(rapid test postive for both).but she had roseola.canshehave anyhealthproblem?

Unlikely to matter: Tamiflu (oseltamivir) is a rather benign medication that does have some potential side effects (nausea, dizziness, sedation, etc.)during use.However, it can be taken by those who tolerate it & not produce any long term issues. It likely did nothing to influence the roseola virus at all. It's not like an antibiotic (it is not) and doesn't produce antibiotic resistance.

No residual effect: There will be no ill effects from the tamiflu (oseltamivir).