Many years ago I read men have cycles. Past years I tried to figure out my cycle, for example to figure out when I could lower my daily dose tadalafil, but I couldn't find a pattern. Did you figer out your cycle?
Because the Kamagra sold in gay sex shops "under the table" could be a too large dose for you or the dose is too low and you take a second and get an overdose.
Here's my experience: I said "I'm having trouble getting a good erection", my doc prescribed Cialis & I didn't have the impression I had "to convince" him.
According to ChatGpt you get tadalafil, sildenafil & other meds online. Please don't trust ChatGpt 100%, double check on other sites if the online pharmacy is reliable or you could ask your doc.
Because I don't want to go (too much) off topic here, I answered your question in one of my topics:
https://www.companyofmen.org/topic/162100-porn-moore/#comment-2567407