I took two 800 mg Motrin because I work at a grocery store and towards the end of my shift my feet hurt real bad. These 'magic pills' really worked and I could barely feel any pain and am able to continue working.

Ibuprofen (Motrin) is a nonsteroidal anti-inflammatory (NSAID) pain medication. What it does is it works on the hormones that causes swelling and inflammation. Pressure is applied to the nerve cells when there is swelling or inflammation involved. This is the main cause of pain. Motrin prevents swelling thereby preventing pain.

Like all pain medications, Motrin acts by helping keep the pain signals from reaching your brain. The pain is still there but your brain doesn't realize it.

Ibuprofen is known to have an antiplatelet effect, though it is relatively mild and short-lived when compared with aspirin or other better-known antiplatelet drugs. In general, ibuprofen also acts as a vasodilator, having been shown to dilate coronary arteries and some other blood vessels. Ibuprofen is a core medicine in the World Health Organization's "WHO Model List of Essential Medicines", which is a list of minimum medical needs for a basic healthcare system.

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Obviously Ibuprofen and other analgesics works by acting on the pain and pain is nothing in your mind. Ibuprofen and other NSAIDs work by blocking cyclooxygenases(COXs) in body. The dosage for adults could be maximum of 3200 mg in a day.

Well, they have mentioned what it can do to your body. here are the side effects that it can bring:
Constipation; diarrhea; dizziness; gas; headache; heartburn; nausea; stomach pain or upset.
Severe allergic reactions (rash; hives; itching; trouble breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); bloody or black, tarry stools; change in the amount of urine produced; chest pain; confusion; dark urine; depression; fainting; fast or irregular heartbeat; fever, chills, or persistent sore throat; mental or mood changes; numbness of an arm or leg; one-sided weakness; red, swollen, blistered, or peeling skin; ringing in the ears; seizures; severe headache or dizziness; severe or persistent stomach pain or nausea; severe vomiting; shortness of breath; stiff neck; sudden or unexplained weight gain; swelling of hands, legs, or feet; unusual bruising or bleeding; unusual joint or muscle pain; unusual tiredness or weakness; vision or speech changes; vomit that looks like coffee grounds; yellowing of the skin or eyes.

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