Wondering the same about clen usage. Mine did not arrive yet, didn't expect the delay. Anyways, I think your body gets accustomed with it in two weeks and you need either to drop it or use a higher dose.

Other than that there is Ketotifen which (I just read didn't try) allows users to extend their use of clen for 6-8 weeks. This last bit of info I got from a really old thread, maybe people changed conculsions since then. Link to it: https://forums.steroid.com/education...-handbook.html