I also get frequent muscle cramps in weird places due to Kadcyla -- under my rib cage in the front and back, in my neck running up to my jaw, in my feet, and in my lower left side -- yowza, they all hurt when they happen! I also have a little muscle weakness in my left knee. I feel like I get the whole pu pu platter of side effects at some point after infusions -- insomnia, dry mouth, neuropathy (now better controlled by the doctor doubling me up on Gabapentin), etc., but it's all still better than my earlier chemotherapy which caused continuous diarrhea.
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