My son has siotica nerve and is in a lot of pain,,,he already went to the dr and they gave him a shot wright on the nerve and he was ok for a few days ,,they gave him ibuprofen 800 mg also cyclobenzaprine 5 mg and methylprednisolone 4 mg ,,he already finished the last one,,,,and he was doing good but all of the suddent the pain came back...he's in extreme pain wright now ,,I'm desperate,,,he took 1 ibuprofen about 2 hrs ago ,,,I just came back from walgreens and I got him and icyhot patch ,,,can he take another dose of iburprofen