It's only a partial answer, but a Nile crocodile can eat up to half its body weight at a sitting, according to National Geographic. Since few freshwater fish weigh half as much as a crocodile, we can probably assume these croc feasts occur when they're able to ambush ungulates (e.g. zebras and antelope).
Probably best to stick to the recommended dosing on the bottle though. For adults, that's 400-800mg four times a day (Maximum 3200mg/day US labelling or 2400mg/day Canadian labelling) Dosing for children is weight based. If your symptoms persist for more than 24 hours with ibuprofen, you should probably see your physician rather than keep taking the drug. Unless you are allergic to it, or have gastric issues such as ulcers or gastritis. Or have kidney disease, or advanced liver disease, or heart disease, or late in pregnancy.
The dose of ibuprofen can range from 200 mg every 4 to 6 hours up to 800 mg every 6 hours. The maximum daily dose anyone should ever take is 800 mg every 6 hours or a total of 3200 mg per day. However, anything over the recommended over-the-counter dose of 200 mg should only be taken on the advise of your doctor.otrin and Advil can be purchased over-the-counter in 200 milligram (mg) tablets, while higher doses require a prescription. Available in tablets and capsules, ibuprofen is also found in combination with other drugs sold over the counter for cough, cold, and migraine.