Ms. Vear wants to try her father on bexarotene, though she does have concerns about possible side effects.

WSJ: Alzheimer's Families Clamor for Drug

"I suppose that's the risk you're willing to take, " Ms. Vear said.

WSJ: Alzheimer's Families Clamor for Drug

Mandy Vear, who lives in Rossendale in the U.K., said that her father's mind has deteriorated to the point where he will get very agitated at times, though he used to be a very placid man.

WSJ: Alzheimer's Families Clamor for Drug