Comparision with Salbutamol and clen(From a client's usage and words) Dosage: 30mg Salbutamol=40mcg Clen, when to take more than one pill, Salbutamol one in the morning and one in the afternoon, to avoid dangerous to the heart. Clen can be taken 2 pills/time, for expert users. Effects: Clen feels much faster than Salbutamol Side effects: Same Usage: Clen is more used for horse, Salbutamol is for human. Salbutamol takes longer time than Clen Half-life: 1 Salbutamol makes effects of trembling and heart beats no more than 2/3 hour. Clen is for 5/6 hour.