The correct dosage of Z-Pak depends on the kind of illness a person has. The dosage can range from one dose every day for five days to a single large dose called megadose, according to Drug Watch.
Zithromax, popularly known as Z-Pak, is a five-day pill regimen that contains half the usual dosage of common antibiotics. It is designed to treat bacterial infections and does not work on viral infections. The common dosage for patients is a double dose on the first day and then a single dose for the next four days, according to Drug Watch. For patients with gonorrhea, a single large dose is prescribed, while patients with sinusitis can have the three-day treatment option.
A single dose of Z-Pak is 1 gram per packet, according to Rx List. This oral suspension must be mixed with 2 ounces of water. Patients can take Z-Pak with or without food, but there is better tolerability when it is taken with food.