Hello, Thanks for the consult... Brief answer, Dolo(paracetamol)-650mg t.i.d Explanation, 1. You already mentioned that your sister has hiv and using medication. Now she had fever try to find the cause of the fever in hiv like common cold and cough, burning micturation, any abcess in the body etc.. 2. Then use medications like trade name-Dolo 650mg generic name- paracetamol 3. If having cough and cold along with fever then use Sinarest-AF tablet or having burning micturation then use Norflox or having any abcessinthe body use ampiclox 500mg tablets Hope this information helps