Bacterial Infection - Can cephalexin cause sweating?

Same thing happens with my 9 months old baby. Did it improve? When?

If he had a fever, yes it would cause sweating and a lower body temp when the fever breaks.

It is not listed as a side effect: https://www.drugs.com/sfx/cephalexin-side-effects.html

But I do wonder about the dosage: https://www.drugs.com/dosage/cephalexin.html

Even at 500mg twice a day that is two to four times the recommended pediatric dose of 12.5mg - 25mg/Kg twice per day (1Kg is about 2.2 pounds). (except for 1 instance where 2gm maximum is used in one day as a pre surgical prophylactic)

His temperature will fall as the infection dissipates but may also be caused by the sweating. I suspect a dosing error; call your doctor today without fail. I'd suggest the ER but that can be expensive for some people. He must see and you must talk to the prescribing doctor or get a second professional opinion immediately.