Hi. I've been taking Baclofen for 25yrs now.
I take 40mg soon as I wake up with 200mg caffeine & 1000-2000mcg's B12. All pills, easy. Another B12 or B100 (when I have them) after lunch.
I take a total of 7 20mg Baclofen = 140mg, almost never tired unless I don't get much exercise for a few days, then my bod adjusts to being lazy so I stay active. Yes I still get terrible spasms, mostly when i'm still for long periods & then move. I swear blood circulation or lack of plays a small part. If I had a pacemaker i'd ask Dr to rev it up a day as test.