My pcp prescribed tinazidine 4mg to be taken as needed. i took one 13 hours ago. before that last night at bedtime. before that is was several days. is it safe to have an alcoholic drink or do i need to wait longer?

If you're referring to the muscle relaxer,tizanidine, the recommendation is to avoid alcohol for 3 days to avoid side effects of dizziness, low blood pressure,decreased alertness,,drowsiness

It generally would be considered safe, but tizanidine can cause grogginess and decreased mentation which would be potentiated or made worse by an alcoholic drink.