I actually know jack-squat about clen - but...
Technically - ephedrine could also be referred to as "asthma medication" - it's commonly classified as a nasal decongestant....because it's a bronchodilator (which means that it eXpaNds the bronchi - the pathways that lead air to and from the lungs)....
- but it also stimulates the CNS (acting on the thyroid, and raising metabolism)....which is why people refer to the e/c/a stack as a "fatburner".....which is actually a misleading name - because it sounds magical (or somehow too effective)....