clenbuterol and albuterol are structurally very similar but the severity of their effects are quite diverse. They are both beta-2 agonists, the downside to albuterol being that since it is in an inhaler form and the full dose will not make it to the bloodstream. Clenbuterol is quite dominant in potency mg for mg when compared to albuterol anyway. In other words, don't spray Ventolin into your lungs 50x a day and expect miracles to happen.