“As regards inhibition, on the other … considerable information available which indicates that omeprazole has the potential to partly inhibit the metabolism of drugs metabolised to a great extent … P450 enzyme subfamily IIC (diazepam, phenytoin), but not of those metabolised by subfamilies IA ( caffeine , theophylline), IID (metoprolol, … (cyclosporin, lidocaine, quinidine).”