<prompt> The drugs that form complexes with pyridoxal are:IsoniazidPenicillamineRifampicinBoth A. and B.  <response>: Ans. D. Both A and BIsoniazid anti-tuberculosis drug and penicillamine used to treat rheumatoid arthritis and cystinuria are two drugs that complex with pyridoxal and pyridoxal phosphate resulting in a deficiency in this vitamin. 