The requirement by the FDA of drugs which have been used for a long time to be officially tested causes problems like this. One example was terpin hydrate. It was a spectacular drug for clearing out my lungs from a really bad cold or bronchitis. I remember getting it in the 1980s when I worked at a drug store and the pharmacist told me “here’s what you want”. But some idiot in the FDA in the 1990s decided it had never been proven to be effective so it was taken off the market. No pharma company wants to put in the money to do full testing because it is out of patent and was only $2-$3 per bottle (cheaper than Robitussin). If they did test it the price would probably jump to $100 per bottle.
Oh man, terpin hydrate helped my cough too. It was great. Robitussin pales.
I don’t know where you live, but I think you can still get terpin hydrate at drug stores in Mexico.
yeah, that stuff was great...tasted like doggie doo, but it worked!!!
Ah yes I do remember terpin hydrate with codeine, aka..GI Gin. Talk about a cheap drunk! When I was young, in the 50’s, my doctor would prescribe it.