(KABC) --Heart attack patients taking the anti-clotting drug Plavix may be at an increased risk of heart attack if they stop.A study in the Journal of the American Medical Association looked at more than 3,000 veterans taking Plavix following a heart attack. They were monitored three, six and nine months after discontinuing its use. Sixty percent of subsequent heart attacks and deaths happened in the first three months.
It could be due to a so-called "rebound effect" in which the body begins creating clots again.
But researchers say more study is needed.