Ptx appears to have Muscle spasticity as a result of MS. Spasticity is treated with a muscle relaxant like Baclofen which is a GABA agonist. Bethanacol is a Cholinomimentic which can be used to treat Urinary dysfunction in Multiple sclerosis. but the Question asks what would help treat the spasticity.
To remember Baclofen is a GABA agaonist and muscle relaxant, I always think of "Greek Baklava". Greek for GABA, and Baklava for Baclofen.