@DearB, I took valium before every chemo treatment. 5mg mostly covered it but occasionally had to take an extra 5mg especially when nurses having difficult time getting a vein. That was once every 3 weeks for four months and didn't have a problem not taking any more once treatment completed. It depends what you are taking it for and if it is to be used on the short term. @AllyJay put it very well. I also tried all the teas and deep breathing etc but sometimes you need a boost to get you over the worst.