http://www.medications.com/effect/view/4415 I am taking Cephalexin 500mg/4x per day. Today is my 2nd day (5 more days to go) and I have tiny red dots all over my legs...it itches......and my arms and back and scalp itch too! Also, last night, after taking my 3rd dose of the day, my stomach started Sun, 06 Jan 2008 23:59:03 -0500 http://www.medications.com/effect/view/4415?item=3877 Unusual weakness or tired is associated with Generic Cephalexin. Consult your doctor. Here is some information associated to Generic Cephalexin which could be useful to you http://www.internationaldrugmart.com/cephalexin.html http://www.medications.com/effect/view/4415?item=3877