im at weekend no- 3, 250 mg test c . 2 times a week d 40 mg per week and my back is still gettn the lower pumps .is it the d or the test c . im getting plenty of water and supps but as i type i can feel it i am going to stop d at 4 weeks. but run test c atleast 10weeks .. i dont remember any back pain with test or anadrol 50 back in the day . or stanozol.