Your doctor or pharmacist may already be aware of any possible drug interactions and may be monitoring you for them. Do not start, stop, or change the dosage of any medicine before checking with your doctor or pharmacist first.
See also How to Use section.
This drug should not be used with the following medications because very serious (possibly fatal) interactions may occur: certain azole antifungals (itraconazole, ketoconazole), delavirdine, HIV protease inhibitors (e.g., ritonavir, amprenavir, lopinavir, nelfinavir), certain macrolide antibiotics (erythromycin, clarithromycin, troleandomycin), nefazodone, telithromycin.
If you are currently using any of these medications, tell your doctor or pharmacist before starting lovastatin.
Infrequently, muscle problems (myopathy) may occur when lovastatin is used with certain other drugs that lower cholesterol/triglycerides. Use caution if you are taking the following drugs along with lovastatin, and tell your doctor immediately if any muscle problems (see also Side Effects section) occur: fibrates (e.g., gemfibrozil, fenofibrate), high doses of niacin (1 gram or more per day).
Before using this medication, tell your doctor or pharmacist of all prescription and nonprescription/herbal products you may use, especially of: azithromycin, "blood thinners" (e.g., warfarin), daptomycin, drugs affecting liver enzymes that remove lovastatin from your body (such as azole antifungals including fluconazole/voriconazole/posaconazole, amiodarone, cyclosporine, danazol, diltiazem, verapamil, rifampin, St. John's wort, carbamazepine).
This document does not contain all possible interactions. Therefore, before using this product, tell your doctor or pharmacist of all the products you use. Keep a list of all your medications with you, and share the list with your doctor and pharmacist.