acetazolamide + bismuth subsalicylate

avoid combo, especially with high-dose bismuth subsalicylate: combo may incr. acetazolamide levels, risk of CNS toxicity, metabolic acidosis, nephrolithiasis, other adverse effects; may incr. salicylate toxicity (renal excretion possibly decreased, additive effects; incr. salicylate distribution to CNS)