... 2nd PE despite taking warfarin, I had a dvt and a PE 3 years ago had treatment for 6 months then they stopped it within 3 months I'd had another dvt so put on life long warfarin,but have now had 2 dvt and a PE despite being on warfarin. No one can tell me why? I'm getting really scared now,I'm a 46 year old woman with chronic asthma. Any help would be appreciated