alt Hacker NewsPhenylephrine worked great for clearing my mucus overproduction. Unfortunately, this has little to do with allergy relief, so I can see why many here hold that it's ineffective. I can imagine how frustrating it must be to have actual allergy issues and be prescribed something that doesn't solve the problem.
It’s not just allergies - taken orally there is no evidence it works for anything, and there’s pretty good evidence it is basically metabolised away.
The frustration largely comes from pharmacists and pharmaceutical companies selling decongestant remedies that do nothing and are known to do nothing.