Can Lamisil and Lipitor Be Taken Together?
Yes, terbinafine (Lamisil) and atorvastatin (Lipitor) can be taken together safely—there is no clinically significant drug interaction between these medications.
Key Evidence
The FDA labeling for Lipitor 11 specifically identifies drugs that require dose modifications or are contraindicated due to CYP3A4 interactions. Terbinafine is notably absent from this list. The contraindicated drugs include cyclosporine, gemfibrozil, tipranavir plus ritonavir, and glecaprevir plus pibrentasvir. Dose limitations are specified only for certain antivirals (saquinavir/ritonavir, darunavir/ritonavir, fosamprenavir, elbasvir/grazoprevir, letermovir, nelfinavir), azole antifungals (itraconazole), and macrolide antibiotics (clarithromycin).
The American Heart Association's 2016 guideline on statin drug interactions 2 comprehensively addresses clinically significant interactions with cardiovascular medications but does not mention terbinafine as a concern with atorvastatin.
Why This Combination Is Safe
Terbinafine has minimal drug interaction potential compared to azole antifungals. While azoles like itraconazole and fluconazole are potent CYP3A4 inhibitors (the enzyme that metabolizes atorvastatin), terbinafine primarily inhibits CYP2D6, not CYP3A4 34. This mechanistic difference is crucial—atorvastatin's metabolism occurs via CYP3A4, so terbinafine does not interfere with its breakdown.
Real-world evidence supports this safety profile. A large postmarketing surveillance study of 25,884 patients taking terbinafine found that 42.8% were on concomitant medications, including lipid-lowering agents, with no new drug interactions identified 53.
Clinical Monitoring
While no dose adjustment is needed, standard monitoring for both medications should continue:
- For Lipitor: Monitor for muscle symptoms (pain, tenderness, weakness), particularly with fever or malaise, as myopathy risk exists with all statins 11
- For Lamisil: Monitor liver function if clinically indicated, as both medications can rarely affect hepatic enzymes
- No additional monitoring is required specifically for the combination
Important Caveat
Do not confuse terbinafine with azole antifungals. If a patient were taking itraconazole instead of terbinafine, atorvastatin would need to be limited to 20 mg daily 1. This is a common prescribing error to avoid.