Clinical takeaways
- Anything that lowers glucose can stack with insulin or sulfonylureas.
- Licorice compounds can raise blood pressure and lower potassium.
- Grapefruit compounds raise blood levels of some statins, calcium-channel blockers and others.
- Ginseng has interaction reports with warfarin; caffeine adds to stimulant medicines.
Glucose-lowering medicines
If you take insulin or a sulfonylurea such as glipizide, adding anything that may lower glucose adds to the risk of hypoglycemia. Know the signs: shakiness, sweating, hunger, confusion, fast heartbeat. Readings under 70 mg/dL need treatment and a call to your clinician.[1]
Licorice (monoammonium glycyrrhizinate)
Glycyrrhizin inhibits an enzyme that normally inactivates cortisol in the kidney, which can cause sodium retention, raised blood pressure and low potassium.[2] A meta-analysis linked consistent licorice intake to hypertension and hypokalaemia.[3] The concern is greater with diuretics, digoxin and existing heart or kidney disease.
Grapefruit fruit extract
Furanocoumarins in grapefruit block CYP3A4 in the gut, raising blood levels of drugs such as some statins, calcium-channel blockers and immunosuppressants.[4][5] Extracts vary in furanocoumarin content and the amount here is undisclosed. If your prescription label warns against grapefruit, ask your pharmacist before using Payarmin.
Ginseng and warfarin
A controlled trial found American ginseng reduced warfarin's effect.[6] Panax species have other interaction reports. If you take an anticoagulant, check first.
Caffeine sources
Guarana and green tea add caffeine. Stack it with coffee, pre-workouts or stimulant medicines and the total can matter; the FDA notes 400 mg a day as a level not generally linked to harm in healthy adults.[7]
A short pharmacist script
"I'm thinking of taking a liquid supplement with chromium, gymnema, green tea, guarana, ginseng, grapefruit extract and a licorice compound, amounts not disclosed. Does that interact with anything I take?" Bring the full label.