How the interaction occurs:
The cause of the interaction is not known.
What might happen:
PABA may decrease the effect of your sulfonamide.
What you should do about this interaction:
Contact your healthcare professionals (e.g. doctor or pharmacist) about taking these two medicines together. They may already be aware of this drug interaction and may be monitoring you for it. Do not start, stop, or change the dosage of any medicine before checking with them first.Reference:1.Mandel GL, Sande MA. Antimicrobial agents. Sulfonamides, trimethoprim -sulfamethoxazole, quinolones, and agents for urinary tract infections. In Gilman AG, Rall TW, Nies AS, Taylor P, eds. Goodman and Gilman's The Pharmacological Basis of Therapeuctics. 8th ed. 1990.