In my quest to conquer ED, I have tried and reported here on my experience with Vyleesi branded, PT 141 (EM power), Tri Mix, Quad Mix, Botox, PRP injections (P Shot), Shockwave ( a real clinic quality system given by an experienced physician). One of the benefits of being treated by an experienced, well trained doc for ED is their knowledge of the meds, and how and when and where they can push the dosing for better benefits. She started me on 5 mg once a day of tadalafil. At her suggestion, the dose increased to 10 mg a day. About 6 months or so ago, we increased the dose to 15 mg, because I kept seeing benefit, with increasing doses. Each increase in dose saw the same side effects come back each time. For me, slight headache, and nasal congestion, and a little flushing. However, after each dose, I saw an increase in ease to get erections, easier ability to keep an erection and better sensitivity. And, after a relatively short time, the side effects dissipated. Recently we increased the dose yet again, to 20 mg per day. Thats a high dose of tadalafil. However, the jump in benefit this time was very significant. Yes, I did see the same side effects come back. Nasal congestion, headache, predominately. But it's now been about a week, and the side effects are largely gone. No more heachaches, nasal congestion is taking less and less time to resolve on its own. Now it comes on when the dose is probably absorbed and at full effect, but only lasts about a half hour or less. The biggest takeaway on effectiveness, has been a very significant increase in ability to get erections and ease in keeping them. I have also seen a very nice increase again in sensitivity. The takeaway here, is once you are acclimated to a medication like this, if you saw improvement but are not where you want/need to be, it is worth the conversation with your doc about increasing the dose. I was concerned about the high dose, however, she reminded me the dosing for pulmonary hypertension (tadalafil is approved and effective for treating pulmonary hypertension) STARTS at 20mg and goes up to 40 mg. So we know it can be taken safely at these doses. It is a relatively inexpensive option for those who have ED issues and worth investigating going up in dose if you are not where you want to be. The KEY it seems for me, was to gradually increase the dose.