There are painkillers at the start of Sarif manufactory in one of the lockers, for segmented you would skip this area with the first boxclip through the fence. Then there are more painkillers in the Boss arena in Fema, a stim in one of the drawers of the first desk in the TYM penthouse and 2 stims in Yelena's room. If you need more before TYM you could get 2 stims at the LIMB clinic in Hengsha. Finally there are painkillers in TYM 1; where you would normally go right and jump down after you pass the security guard you can go left and jump down and land near the small cabinet which has painkillers at the bottom.
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