That is the recommended dose: 1.0 gram (same as 1000 milligrams [mg]); and it makes no difference whether two 500 mg pills or four 250 mg ones. Even double that amount is perfectly safe, and is sometimes used, for example to treat gonorrhea or syphilis. Chlamydia typically is cured with that treatment; it takes 5-7 days for the infection to be cleared up.
Good luck-- HHH, MD
Can Zithromax be used for how many STD'S
i WOULDN'T RECOMMEND TAKING MORE THAN ADVISED BY THE PHYSICAIN. BE CAREFUL...DON'T START DOSING YOUR OWN PRESCRIPTONS.