First you may want to switch from the Ibuprofen and give Tylenol as one will respond better to one or the other. When it comes to fevers in adults, If it persists for more than 3 days, then he should be evaluated. Since it's only been less than 2 days he will be OK to wait till morning. But he needs to be seen tomorrow. Make sure he is getting plenty of fluids, so he doesn't become dehydrated. If he get ANY other symptoms, then take him in. Try the Tylenol and see if this helps. If this doesn't at least help to bring it down to a low grade of 99 or so, for longer than 2 hours, then I would have him seen. If you are not 100% sure he will be able to get into his doctor in the morning, then I would also have him seen. There are so many causes for a fever that without additional in person evaluation and/or blood work is not way to pin point.

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