I use Dr.Fox online, where there's a variety of ED medications available.
You fill in a questionnaire, then one of their doctors has to okay it. They have a pharmacy shop in Glasgow apparently to.
Seems legit, as does the reasonably priced products.
Not taking my own advice, but you should probably see your own doctor first, if you feel you've been experiencing ED symptoms for a while, as there could be an underlying health problem.
I've tried quite a few of the range, starting with viagra connect, which you can buy at any chemist. It's a matter of finding which works best for you, taking as low a dose as possible, to minimise side effects, such as headache, flushing, indigestion, congestion.
Personally I have found, taking a couple of paracetamol, and at least a pint of water with the ED tablet, keeps me right.
I take Vardenafil, which used to be sold under the brand name -Levitra, but it seem to have discontinued .
I would buy the 20g dose, but use pill cutter to half it, as this works out much cheaper, buying in a decent quantity.