Efficacy of alternate-day dosing versus daily dosing of atorvastatin

Atorvastatin is a synthetic inhibitor of 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase. In placebo-controlled trials, it has been shown to achieve significant dose-dependent reductions in low-density lipoprotein cholesterol, total cholesterol, and triglycerides. This trial compared the efficacy of daily atorvastatin administration with that of alternate-day dosing.

This was a randomized, prospective, nonblinded, controlled clinical trial. Fifty-four patients with low-density lipoprotein cholesterol of 100 to 200 mg/dL were enrolled. Baseline fasting lipid profile (total cholesterol, low-density lipoprotein cholesterol, high-density lipoprotein cholesterol, and triglycerides), liver function tests (aspartate transaminase and alanine aminotransferase), and creatine kinase were drawn. Patients were randomized to three atorvastatin dose groups. Group I received 10 mg of atorvastatin every day, Group II received 10 mg every other day, and Group III received 20 mg every other day. After 6 weeks of treatment with atorvastatin, fasting lipid profiles, liver function tests, and creatine kinase concentrations were redrawn. Compliance to treatment was assessed at each visit.

Of the 54 patients enrolled, 46 completed the study. All three regimens significantly reduced total cholesterol and low-density lipoprotein cholesterol compared to baseline. No statistically significant differences existed between the three groups in regards to total, or a percentage, decrease in total cholesterol and low-density lipoprotein cholesterol at 6 weeks compared to baseline. All regimens were well tolerated and none of the patients had a significant elevation of liver enzymes or creatine kinase during the course of the study.

Alternate-day dosing of atorvastatin is an efficacious and safe alternative to daily dosing.