F.D.A. Approves Fat-Blocking Anti-Obesity Drug
Food and Drug Administration approves use of orlistat, first in new class of anti-obesity drugs that work by blocking body's absorption of dietary fat, as opposed to appetite suppresant drugs that trick brain into ignoring hunger; approves drug for seriously overweight people who meet Govt's definition of obese--namely, those 30 percent overweight and those 20 percent overweight who have high blood pressure, high cholesterol and diabetes; despite concerns by many about its effectiveness, experts say drug may soon become familiar fixture in homes of millions of Americans; drug, recommended for use three times per day for periods of year or longer, is expensive, costing about $1.10 per capsule; is manufactured by Hoffman-LaRoche (M)