Cialis is great but even if I just have 20mg I usually get horrible headaches the next day. The effects of 20mg are amazing for me but not worth the headache. 20mg can also cause me to feel hot and experience facial flushing and it can be extreme to the point people ask if I am ok because I am bright red

At 10mg I am ok and that dose suits me best. As an experiment I might try 40mg one day but I know it will be intense. I know people who have used 40mg and not felt much so the difference in response can vary massively.