If you are currently being treated with any of the following medications, you should not use licorice without first talking to your healthcare provider:

Ace-inhibitors and diuretics
If you are taking angiotensin-converting enzyme (ACE) inhibitors or diuretics (except potassium-sparing diuretics) to regulate blood pressure, do not use licorice products. Licorice could interfere with the effectiveness of these medications or could worsen possible side effects.

Aspirin
Animal studies suggest that licorice may reduce stomach irritation as well as the risk of stomach ulcers associated with aspirin.

Digoxin
Because licorice may dangerously increase the risk of toxic effects from digoxin, this herb should not be taken with this medication.

Corticosteroids
Licorice may increase the effects of corticosteroid medications. You should consult with your doctor before using licorice with any corticosteroids.

Insulin
Licorice may enhance some of the adverse effects of insulin.

Laxatives
Licorice may cause substantial potassium loss in people taking stimulant laxatives.

Oral contraceptives
There have been reports of women developing high blood pressure and low potassium levels when they took licorice while on oral contraceptives. Therefore, you should avoid licorice if you are taking birth control medications.