Unfortunately, fatigue is a possible side-effect of most symptom relief. Definitely of Baclofen, also of codeine and diazepam, which I take as well - and I think when I briefly tried Gbapentin, it said so too (certainly didn’t help, and made me feel drunk, so that one didn’t last long).
Whenever I raise fatigue with any of the neuros, they are always very keen to pin it on the drugs I’m on, and encourage me to cut down.
However, my GP is more sceptical, and checked my notes to find I’d been complaining of fatigue before I ever took the drugs!
I sometimes get the impression the object of the neuro consultations is to persuade me nothing I get is actually caused by the MS at all. Apparently, my fatigue is caused by the drugs, and my pain (because it’s not nerve pain) wouldn’t be caused by MS either.
So I’m ill all the time with diddly squat, because MS is responsible for none of it. I honestly thought diagnosis would draw a line under this, and professionals would know what I’m talking about. They don’t even put pain or fatigue (my two worst issues) in the notes, because they don’t accept MS is responsible.