Pharmacology Unorable interaction of drug and substrate in human beings are all except: A Omeprazole reduces stomach acid B Methotrexate inhibiting folate C Barbiturates decreases B 12 absorption D Retinoic acid inhibits vitamin E 💡 Explanation Unorable interaction of drug and substrate in human beings are all except: ✓ Correct Answer: A. Omeprazole reduces stomach acid