Why would a 15 year old boy want/need 800 miligrams of ibuprofin; and feel the need to hide it. Are there hidden hights/side affects with it or with use of other substances?

Not sure what you are asking
How do you feel he is 'hiding' it? Who is he hiding it from?
What do you mean by with use of other substances?
Do you mean if it is taken with other medicines?
What medications would he be taking also?

800 milligrams of ibuprofen has very little if any side effects and
Most likely would have to be taken on a regular basis or abused to get these side effects.

The most common side effects from ibuprofen are rash, ringing in the ears, headaches, dizziness, drowsiness, abdominal pain, nausea, diarrhea, constipation and heartburn. NSAIDs reduce the ability of blood to clot and therefore increase bleeding after an injury. Ibuprofen may cause ulceration of the stomach or intestine, and the ulcers may bleed. Sometimes, ulceration can occur without abdominal pain, and black, tarry stools, weakness, and dizziness upon standing (orthostatic hypotension) due to bleeding may be the only signs of an ulcer. NSAIDs reduce the flow of blood to the kidneys and impair function of the kidneys. The impairment is most likely to occur in patients who already have impaired function of the kidney or congestive heart failure, and use of NSAIDs in these patients should be cautious. People who are allergic to other NSAIDs, including aspirin, should not use ibuprofen. Individuals with asthma are more likely to experience allergic reactions to ibuprofen and other NSAIDs. Fluid retention (edema), blood clots, heart attacks, hypertension and heart failure have also been associated with the use of NSAIDs.

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Originally Posted by Shellboki

Why would a 15 year old boy want/need 800 miligrams of ibuprofin; and feel the need to hide it. Are there hidden hights/side affects with it or with use of other substances?

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In my area other drugs are cut with ibuprofin.