I just wrote a long reply and poof my Mac f'd up and I had to reload the page... So here's the gist of what I wrote. I'm a male on bupe ('08 - today), methadone and IV heroin 2000 - 2008. When I started the methadone program I had no interest in sex, women, etc... I was fatigued, overweight (after a few months) and somewhat depressed. I figured, not sure how, that this could be testosterone related. I was 'scripted the patch in 2005, did jack shit except irritate the fuck out of my skin. I stopped that and lived with the symptoms above until the love of my life came along in '08 and I was concerned anew with my lack of drive, interest, ect...
In late 2008, after switching to bupe, I went to a new MD and he informed me of a new formulation of testosterone. It cannot be taken orally b/c of its extremely short half-life - something like 10 minutes! This is why there is no testosterone pill. The new formulation is a transdermal gel, two brands in the US that I know of, Testim (I use this one) and Androgel. I believe they are quite similar. You apply the gel in the AM to your upper arms/shoulders. You must use it daily. Takes a few days/weeks to notice the effect but if you need it and use it properly I think you'll really like it.
It's abusable, too much will have the effects many body builders look for but that's a seriously sharp double edge. Cancer, testicular atrophy, male breast, etc... Do not overuse to achieve desired physique, do that on your own, or pay the very serious price many former olympians could tell you about and regretfully so...
Get your blood levels checked, and ask for the gel. Shots do work - somewhat - but are a pain in the ass and don't maintain an even blood level. The gel does a wonderful job of mimicking the body's own production of testosterone. For me this was a wonderful development and helped me improve the quality of my life drastically.
I lost fat, gained muscle (net gain of weight, but better body shape), the return of morning wood, increased sex drive and performance like I'm 18 again, no shit - able to rip off multiple orgasms a day several days in a row if I want , I can wear my woman out! What a great feeling. It's been nearly four years since I started using the gel and I have no negative side effects that we can detect, normal PSA, no prostrate enlargement, testicles are fine, no lumps/bumps, normal testosterone levels, etc.. I noticed increased energy, faster rebound from injury and physical exertion, improved and more stable mood, etc...
Follow the directions to the letter. There are many important but very easy to follow instructions for use, don't expose others, apply every day, apply to the proper areas (shoulders/upper arms), etc.. Applying it to the fatty areas around your belly isn't a good idea as adipose fat contains enzymes that metabolize testosterone b/f it can get into your blood stream.
And people, don't try to use this gel as a transdermal agent for other substances. Use as directed. If you want transdermal delivery of your DOC see if it's soluble in DMSO and go that route at your own peril.
Hope this helps. Again, DO NOT overuse/abuse this product. It will backfire in a terrible and possibly irreversible manner. There are easy ways to know you're using too much, but these symptoms may not develop in everyone - acne (back and ass in particular - but this also happens at normal levels in some), male breasts, shrunken balls, aggression, loss of sexual function, excess muscle build up (yes, I know many 'roiders would like this, but that's a terrible reason to use a steroid...)
Best wishes on a renewed sex life, and life in general, to anyone who finds themselves low on testosterone for any reason. Opioid dependence definitely can lead to low "T" as the pharma marketing people like to term the disorder "hypogonadism".