I would recommend running the Clen Post cycle. Read this:
http://www.steroid.com/Clenbuterol.php
It says:
"Based on its rate of elimination from the body, and how much is usually needed to be effective for athletes, my recommendations are the same for both men and women.
You´ll need to take 20mcgs upon rising, and then repeat that same dose again later in the day, and then once again in that day (if you find you can tolerate the effects). So you´ll start with 20mcgs, and then repeat that dose 2 more times that same day if you can tolerate it (side effects will determine this hand shaking, sweating, etc& classic stimulant sides). Then you can start increasing the dose gradually. Personally, I wouldn´t work my way up to more than 200mcg/day. 60-120mcg/day is an average dose. And keep your Blood Pressure at (or under) 140/90, while on clen, just to be safe. If you go over that, lower the dose. You´ll also want to know your body temperature, upon rising, for the week before you start taking your clen, and then monitor it (again, as soon as you wake up) throughout your clen regimen. When it returns to the level it was at before you began taking the clen, you´ll need to start taking your Benadryl or Ketotifen, as the decrease in Body Temperature back to original levels indicates the thermogenic effect is beginning to decline."
It also says:
"Clenbuterol can also cause a downregulation in testicular androgen receptors and in pulmonary, cardiac and central nervous system beta-adrenergic receptors(6.) possibly making steroids less effective (if there is androgen receptor downregulation elsewhere as well, then it´s highly probable) while you are on clen; but definitely making clen less effective as time goes on and you keep taking it.
To counteract this, you can take some ketotifen every 3rd or 4th week that you remain on clen. It´s a prescription anti-histimines, so it´ll make you drowsy (take before bedtime). Basically, the way this works is to reduce beta-2 receptor activity, and restore receptor function (15)."
So basically the summary is not to take more than 200mcg/day for a max of 4 weeks; and taking Benadryl every 3rd and 4th week would help increase the effectivness of the Clen