It is important to know why is there a fever
. For that we take clinical history, examination and then run blood tests, simplest of all being cbc
usually is taken by many an over the counter drug and there is usually no regulation on when to start it. If you are having sustained temperature above ~99-99.5 °f, we can start paracetamol for symptomatic relief. It is very important to know the reason behind getting a high temperature. Temperature measured in axilla can be a bit lower than oral. Minimum time to keep the thermometer - 3 mins at the site of measurement. Paracetamol 500 mg/650 mg can be taken 6-8 hrly as per diagnosis made. Self medication is not at all recommended. It does more harm.