I Have A Medical Condition Called Hidradenitis Suppurativa. I Was

i have a medical condition called Hidradenitis Suppurativa. I was prescribed Cephaalexin 500 MG. Dosage is 3 tabs per day. It is not working. The prescription info states the pill is green in color and hasLupin Lupin on one side and 500 500 on the other side. The pills I have been taking only have the words Lupin Lupin. Is it possible I received the wrong pills? I have been very larthargic and sleeping a lot. I have Type II diabetes and take 500 mg of metformin twice a day.