I always have had low blood pressure, and really shouldn't because I am a long-time smoker.
I have a blood pressure monitor, and keep an eye on things. When I start to get periods of light-headedness (which can occur for several weeks at a time), I eat about a dozen pretzels.
HOWEVER, if you think this might be caused by your meds, and it is making you feel unwell, I don't think a bandaide (pretzels) is the right solution for you.

You should talk to your doc!
Cherie
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I am not a Neurologist, Physician, Nurse, or Hairdresser ... but I have learned that it is not such a great idea to give oneself a haircut after three margaritas
.