Sativex

Is anyone taking Sativex, the cannabis extract for pain and spasticity ? If so, how is it going, and can you take it with Naltrexone? I’m struggling with pain at the moment. I currently take Amitriptyline 10mg, and Naltrexone 3mg. I find it difficult to tolerate most medication. I know Sativex has been approved for MS use now, so I just wondered how people are finding it. Many thanks.