Got mine today at 4.30pm. Now 1am and feel fine. Also did 4hr journey afterwards. Arm just feels like I banged it. Not very sore. Just a twinge if I move it around. No redness or swelling. No other symptoms. I'm on altenol for hbp and escitolopram. No interaction. Took ibuprofen at 6pm as thought arm might hurt while driving. But no problems.