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I feel he needs an examination by doctor now,
A diagnosis needs to be made for such severe headache before giving Sumatriptan.
Till then, please continue with ibuprofen or acetaminophen.
Ibuprofen can be repeated 3 -4 times, it can be given 6-8 hourly.Acetaminophen can be given 4-6 hourly but not to exceed 5 doses.
Please keep him at rest.
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