I've Been Taking Naltrexone For Over A Year For My

I've been taking naltrexone for over a year for my m.s. which I was diagnosed with over 25 years ago. I'm a 65 year old male taken copaxone injections for about 10 years. How do you rate naltrexone? I have usually 3 to 4 flareups a year I've only had 1 since switching meds and really feel great. I usually go to the gym 5 days a week 1 1/2 hours weight training and 30 mins cardio. Fot me that seems to be the ticket. Any comments or suggestions? Thanks Terry