I am having a gum graft surgery done in a week. My doctor has just prescribed 5mg Valium and told me to take 3-4 approximately one hour before surgery. This seems like a very high dosage. I have taken single 5mg doses of valium in the past for muscle spasms and tripling or quadrupling this worries me. I am a 25 year old female, in good health, 138lbs. Does 15-20mg dosage before a gum surgery sound appropriate?