A member asked:

Propanolol gives me headaches and makes me really alert instead of tired. im not on any other medications. what would cause this?

A doctor has provided 1 answer
Dr. Kenneth Lanier answered

Specializes in Pharmacology

Vasodilation: Propranolol cases your blood vessels to dilate (vasodilation). When this occurs in your brain it can cause headaches. If having hyperthyroidism caused you to feel drowsy or fatigued, you may now be experiencing alertness because the medication is treating the condition.

Answered 3/24/2015

5.1k views

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