Muscle cramps are the most common side effect of clenbuterol. They probably happen because of depletion of taurine in the liver in combination with deficiency of sodium and potassium electrolytes and insufficient hydration. Taurine helps to strengthen cell membranes and prevents overexcitement of the nervous system. Some studies show that obtaining taurine as an additive weakens painful muscle cramps. Japanese scientists found that the longer the experimental rats were subjected to physical exertion, the more taurine lost their muscles. (Matsuzaki Study, 2002)
Personally I have used T3/Clen several times (both with and without testosterone) and regardless of what other substances I used or what diet, I saw my desired fat loss. If you have a good source it is really strong stuff that works. I just recently came off of a Test E/Tren E/EQ 16 week cycle weighing in at 217 at 5'8 and 15%. I immediatley went into PCT and combined T3 at 125mcg/ed, clen (two weeks on, two weeks off) 120mcg/ed, and Proviron at 75mg/ed, and in just over 3 weeks I am down to a very hard 204 (have not measured bf, but would guess right around 12%, my abs are completely visible, just not shredded), the diet i've used with this is a very basic carb cycle. Take what you can from my personal example, hope that helps a little but I think your going about everything the right way
Shortly after answering the question of what is clenbuterol, many beginners want to jump straight to using this drug. That's because - no matter their current fitness level - many want a magical pie-in-the-sky solution to getting ripped fast. And while clenbuterol weight loss is rather quick, it's better to do as much as you can naturally before going the drug route. This is especially the case when considering that high blood pressure and increased heart rate are possible clenbuterol side effects. So if you've just polished off a 20-piece Chicken McNugget by yourself, work on your diet and cardio before reaching for clen.