What is the typical daily oral dose range for Sulfasalazine?

• A. 100 mg daily.
• B. 1 g daily.
• C. 500 mg-3 g PO daily.
• D. 5 g daily.

Answer: (C)

Dosing in adults for sulfasalazine is typically in the gram-per-day range, usually starting low and titrating up to about 0.5 to 3 grams per day in divided doses. This range reflects its use across inflammatory conditions where the goal is to deliver enough active metabolites to achieve anti-inflammatory effects while keeping side effects manageable. Sulfasalazine acts as a prodrug that is activated in the colon, releasing 5-aminosalicylic acid and sulfapyridine, so effective amounts are achieved with dosing in the hundreds of milligrams to a few grams daily, not at milligram-level quantities. In practice, many regimens aim for around 2 grams per day, with possible escalation to about 3 grams if tolerated and needed. Doses much lower (like 100 mg daily) are typically insufficient for therapeutic effect, while doses like 5 g daily are higher than usual and associated with greater toxicity.