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Basically the drug is well tolerated by patients of all ages, even at higher dosages. Hence a low dose of 2 mg though effective for PTSD will have fewer side effects. For lowering of blood pressure this medication is given in a dosage of 6-15 mg. And the side effect that is most common and that may occur is transient dizziness and mild orthostatic hypotension symptoms. This is a form of low blood pressure that happens when you stand up from sitting or lying down, and can make you feel dizzy or lightheaded. Hence be careful not to stand up too fast. Even this side effect usually stops when your body is used to prazosin.
Therefore please do not worry, your blood pressure will not go down to dangerous levels while you are sleeping and your body has in built mechanisms which will maintain your blood pressure at all times despite this low dosage of prazosin.
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