OP what bigorse is saying is that if you take ketotifen or benadryl you can extend your clen cycle for up to 8 weeks while continuing to receive the benefits of the clen. The only reason you cycle off is because, in short, your body gets used to it and it stops working, The 2 weeks off is for your body to readjust. The ketotifen or benadryl keeps your body from getting used to it so there's no need to cycle off. As bigorse stated it has everything to do with your beta 2 receptors.
I do have a question for those that know, however. I know the keto dose is 100mg but what is the benadryl dose?