 [ Symptoms ] what can you give a 20 year old on warfarin for a fever of 102 on a mouth thermometer [ Disease ] usually if an adult gets a fever over 101f we suggest he or she seek medical attention that said you ask a great question no one taking warfarin should take an over the counter blood thinner or nonsteroidal anti inflammatory nsaid pain reliever these include aspirin and products containing aspirin ibuprofen and naproxyn sodium the main over the counter pain a fever medication for people taking warfarin is acetaminophen tylenol however given that your 20 year old is on warfarin i would suggest you consult his or her primary health care provider about both the fever and about what medication would be safe for him or her to take because i do not know your child is medical history the information i give here is strictly generic in nature and should not be construed as instructions or medical advice take care