^ haha yeh that works

the combo is actually illegal in Australia (as ephedrine is banned). Given he's 16 I don't think he should be taking weight loss / cutting stacks though. It's also worth looking into one's family history for heart problems before doing so regardless.
Edit: promethazine is a strong 1st-gen antihistamine & unrelated to ephedrine. Might not be wise to take it if you're trying to lose weight, reduce appetite etc though as it makes you pretty drowsy & I'm pretty sure these types of antihistamines may have been linked to weight gain? I'd have to look into it more though so don't take my word for it.