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According to my doctor, 4 hours. You can switch them up. Take acetaminophen, (Tylenol), then wait 4 hours and take Ibuprofen, wait another 4 hours and take acetaminophen and so on. :) 15 people found this useful.
You can take ibuprofen over the counter. The recommended dose is 2 tablets every 4 to 6 hours. Talk to your doctor though as mine has me take up to 4 tablets every 4 to 6 hours (the maximum and what takes it to prescription level). Absolutely makes cramps manageable for me.