No they are the same thing - hcl stands for hydrochloric acid which is the salt in the cephalexin capsules.
No. It is part of the cephalosporin family. However, in terms of allergies there is a chance of cross sensitivity between penicillins and cephalosporins. If you are allergic to one, it would be wise...
Na bruh take some vicodin
Cephalexin is an antibiotic
No. Cephalexin is an antibiotic - and does not produce a high.