I've been on Sativex for almost three months now to relieve stiffness in my legs and butt. I also take baclofen which was helping but not enough and my MS nurse suggested Sativex instead of just increasing the Baclofen dosage.
I had to have a specific (Ashworth) assessment of the spasticity in my muscles which our local neurophysiotherapist carried out. My neurologist then prescribed a Sativex trial for me. I had another Ashworth assessment after 6 weeks on Sativex and the stiffness was loads better. On the basis of that, my neuro was happy for me to continue with the drug.
It has the side effects you'd expect from a cannabinoid drug, with the exception of the munchies ! I started with one spray in the evening and increased it according to the instructions provided. I have settled on three evening sprays which relaxes my muscles overnight but allows me to go to work the following morning. When I tried a spray in the morning I found that I was away with the fairies - fun when you're a youngster and at a party maybe, but not when you're at work.
I sound like a legal junkie when I tell you I take Gabapentin & Amitriptyline for pain and Baclofen & Sativex for spasm/spasticity - but it keep me doing the job I love and paying taxes.
Good luck with getting your medication sorted out. I know how terrible it was before I got pain relief