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Dose. The normal dose of Plaquenil is 1 tablet a day (200mg/day). Some doctors recommend 2 a day (400mg/day) but we find that 1 a day suits most people-the dose can always be increased for a flare.One of the attractions of this medication is its long 'half-life' - it stays in the system for days & weeks.ose. The normal dose of Plaquenil is 1 tablet a day (200mg/day). Some doctors recommend 2 a day (400mg/day) but we find that 1 a day suits most people-the dose can always be increased for a flare.
Usual Adult Dose for Cystitis. 250 to 500 mg orally 3 times a day for 3 to 7 days; alternatively, 500 to 875 mg orally twice a day may be administered. Usual Adult Dose for Urinary Tract Infection. 250 to 500 mg orally 3 times a day for 3 to 7 days; alternatively, 500 to 875 mg orally twice a day may be administered. Usual Adult Dose for Helicobacter pylori Infection. 1 g orally 2 to 3 times a day for 14 days.