Which statement describes how enzymes in the body can affect some medications when alcohol is involved?

• A. It increases the efficacy of all medicines
• B. It has no effect on liver
• C. Enzymes in the body can change some medications into chemicals that can damage the liver or other organs
• D. It makes all medications safe to take with alcohol

Answer: (C)

When alcohol is present, the liver’s enzymes can change how medications are processed. For some drugs, this interaction creates new, reactive byproducts that can damage the liver or other organs. A common example is acetaminophen: alcohol increases the activity of a metabolizing enzyme that converts it into a toxic compound, and if too much of this toxic metabolite forms or the body’s glutathione is depleted, liver injury can occur. This is why alcohol can heighten the risk of harm with certain medicines. Not every drug behaves this way, and some interactions can reduce effectiveness or cause other issues, but the essential idea is that enzyme-driven changes in the presence of alcohol can produce harmful chemicals from some medications.