albuterol is also a selectable beat agonist, but it is not as 'strong as clen', One of the reasons for this could be it's shorter half-life (5-6 hours). Side effects are usually not reported on doses of 12-16mg ED.
I have never used clen, but albuterol did a 'good job' and i had no sides on 16mg ED
Because of it's short half life, it is 'best' taken 3 times a day