My elder brother is suffering from fever since 20-25 days but not all time his fever come and go and often times come in night and have temperature of 100-101 ,fever often comes after a week or two three days after taking paracetamol his all tests are normal cbs, widal, urine,malaria, kidney and liver. But his pulse rate is above 100 but less than 120. Many doctors gave him antibiotics for infection whenever he takes it he is fine for few days and than again suffers from fever after he stops taking it.