Cationic ampiphylic drugs are known for their ability to inhibit phospholipase A2. Benadryl (diphenhydramine) is a cationic ampiphylic drug.

Ergo, Benadryl slows desensitization of Beta receptors (i.e. Upgrades them) by inhibiting phospholipase A2, which is the enzyme that breaks down methylated phospholipids, and this action in turn keeps the phospholipid membrane stable, and thus keeps the receptors functioning properly. (7). This will allow you to use clen for much longer and it'll still have the same effects. Also, since Benadryl is an anti-histamine, and histamines have a direct effect on beta-adrenoreceptors (not just Beta-2’s but all of them), using an anti-histamine will have a direct effect on reducing beta-receptor stimulation (16), and thus upregulating your beta-receptors.

Since we’re speaking about beta-receptors and upregulation, here, let me address the claim that you can use ephedrine (or the ECA stack), alternating with clen, in order to avoid receptor downgrade. I’m not sure where this rumor came from, but it is totally incorrect.

To dispel this myth, lets examine ephedrine for a second. Remember when I said that using clenbuterol to stimulate the beta-2 receptors is like hitting a tack with a hammer? Well, Ephedrine is like a sledge-hammer, it hits the beta-2's and everything around them. Thats because it's not selective, but rather it stimulates other receptors to a great degree as well.

Anyway, one of those receptors that ephedrine hits is the Beta-2 (yeah...the same one as Clen). As you can see from the graph below(ephedrine is represented by the the solid circles), it reduced Beta-2-AndrenergicReceptor (what we call, in laymens terms, the "Beta-2 receptor") levels to 32% of the control level after 24 hours. Read this again:

Ephedrine, in this study, reduces Beta-2 receptor levels to 32% of control after 24 hours.
(see the solid circles in this graph represent ephedrine)
bhgdid-1.gif
Granted, it's not perfect, it's not in vivo, etc...but there's no denying that ephedrine will downregulate beta-2 receptors....ergo you will not be able to use it on the weeks inbetween your clen to upgrade your receptors.

Also, bear in mind that clen isn’t great for your heart, and can cause some issues there (enlargement of ventricles, etc…) but most studies showing clen to cause heart problems are with animals, and even though the dosing is almost similar to what humans take (in some studies it’s within the range of what would be double of a large human dose...) it’s important to remember that animals have more beta-2 receptors and they cause certain event chains that humans’ beta-2 receptors may not. Clen causes cardiac hypertrophy and cardiac necrosis (cell death)to some degree, in some cases. Again though, many studies showing the more significant, possibly irreversible, heart problems are with mg dosing. We humans take clen in mcg doses.

If we want to duplicate those “theraputic” levels of clen seen in the more conservative studies, we’d still be taking just over 1mcg/lb of bodyweight, twice a day. I’d suggest a bit less than half of that dose, however, even if just to avoid cardiac complications.

Performance issues with clen also vary. Some studies show reduced exercise (cardiovascular) performance with clen (9), while some show that clen can alleviate exercise induced asthma (10)!Clearly, this compound will have different effects on different people, and I suspect that a lot of it is sports specific. Many bodybuilders claim that clen makes it difficult for them to do cardio, yet I can play a full game of rugby on it. You need to figure out how it affects you, and tailor your dose personally.

Finally, this brings me to the issue of cramps while on clen. I don’t get them. My friends don’t get them. Most of us are athletes who use clen during the season as well as the off season, and one of my friends even claims that it gives him more “wind” (cardiovascular stamina). Take on enough water every day and you should be fine. If you’re really concerned, you can take some extra minerals and taurine, since clen depletes taurine (11) as do most if not all beta-agonists. I don’t take anything more than my usual vitamins and minerals.

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