I never get a back ache just stuffy nose and ( at 20mg ) headache.
Ive noticed if I use 10mg I get a nice 24 hour window of rock hardness so Ive been using that recently. Actually it still has a noticeable effect at 36 hours even at 10mg.
I have experienced this to an extent. It is somewhat difficult to locate the pain, it's more on th einside, i don't know around the Quadratus Lumborum or even lower digestive area. I started taking Aspirin for it. My face gets red too.
Def the cialis. I get lower back pain everytime I take it, the ag stuff. It is worth it but sometimes I wake up with my back sore. I am sorry it happens but glad to hear it isnt just me.