I think it's best to just take in him feeling good rather than which med is working. Right now this is what works and it's def a blessing. Whenever the time comes for him to get off the vivatrol he will be weened off and the doctor will only let that happen if he or she believes it's the best idea. While he's on it he should be focusing on recovery and building a better mindset and working the program and hanging with new clean/sober crowd which will help a lot. I'm very happy that these meds are working for him, just be mindful and in the moment day by day!