Once you feel a therapy dad is desired affect, it's a good idea to attempt to stop.
This was my modus operandi with ther botox that I'd been using to reduce the contraction of my hand and leg.
As my muscle tone reduced, so to did my contractures (clenching spasms). But once I felt my grip strength start to weaken too much, I called full-stop, cold turkey cessation. That decision, in retrospect, I see as a positive one.
I now mitigate my spasms with weightlifting, stretching, good old fashioned pushups, and protein powder for an added kick.