We studied the therapeutic effect and safety of lovastatin in 18 patients with nonfamilial primary hypercholesterolemia.

Patients received 20mg/day lovastatin therapy as a single evening dose.

If the total cholesterol level exceeded 200mg/dl after 2weeks of lovastatin therapy, the dosage of lovastatin was doubled.

Mean percent total cholesterol level reductions from baseline were 26.4% and 31.9% after 4, and 8 weeks of lovastatin therapy respectively.

Mean percent HDL-cholesterol level increase from baseline were 12% and 13% after 4, and 8 weeks of lovastatin therapy respectively.

Adverse effects attributable to lovastatin were mild and temporary and no patient was withdrawn from therapy. We concluded that lovastatin was a well tolerated and effective agent for the treatment of nonfamilial primary hypercholesterolemia.

Further studies are needed to establish the long-term safety and effectiveness of this drug.