As of this morning, I have a theory of why my fatigue has increased on Tysabri. It can lower the blood pressure. Also, I got an elliptical machine before the holidays and use it once or twice a week for heart health.

Well, I was having a nuclear stress test for my heart function this morning. I went in without eating, but had taken my meds with water, including the blood pressure meds.

My BP was so low at the beginning of the test, (90/70) they had a hard time getting a reading. At the peak of my heart rate, it was up to 98/70.

In the past, I've needed to cut down on meds because of sleepiness. This could be a part of my current fatigue? At least I hope so. I need to call the PCP and tell him what happened and ask about cutting down.

So if you take Ty, and you're on BP meds, this is something you might want to keep an eye on.

If this is true, and the meds are adjusted, then I might really feel a lot better. I hope they don't find anything wrong with the heart (or anywhere else) and I can cut down on the meds that make me extra tired.