New Plavix Warning: Lack of Effect in Many People
The anti-clotting drug Plavix will get a new "black box" label warning that normal doses don't work for 2% to 14% of patients.

Pill Kills Hard-to-Treat Head Lice
Stromectal -- a pill containing ivermectin, a drug used to prevent heartworm in dogs -- kills head lice resistant to first-line treatment better than malathion-based lotion.