headache
"I've taken Fiorinal for about a year, initially it was great.  One pill would totally knock out a headache. Little drowsy for about 30 minutes and I was good to go. Started having to increase the the number of times I take it about 4 months ago, started having abnormal vaginal bleeding; my doctor thinks it's the aspirin and the fact that I've had to take more. Aspirin is a blood thinner. I switched to Fioricet, same drug, but replaces the asprin with Tylenol. Back to normal now. Try Fioricet if Fiorinal dosen't work for you."