How long do your symptoms of strep throat last after starting antibiotics?

1or 2 days. You will begin to feel better soon but please finish the rx.A big problem we face is the bacteria , exposed to less than a full course of treatment, learn to resist that antibiotic.
STREP TONSILLITIS. Improvement is noted1 to 2 days after start of treatment but rx has to be finished for 10 days to complete cure and avoid recurrence.