That's pretty intense BP med there. 40mg at
cap value for for Olmesartan. Must be some serious issue the doctor wanted to use at that max value. Commonly, it's only 20mg for adults. Make sure to stay hydrated as much as you can. This med, although not as common, can cause your system to get quite dehydrated without you knowing. If you can, ask the doctor to reduce the dosage to 20mg if it's feasible. If it's not feasible, do get the reason why.