The maximum recommended dosage of ibuprofen for an adult is 3,200 milligrams per day, or four maximum doses of 800 milligrams each, according to Drugs.com. Patients taking ibuprofen should use only the amount they need to relieve their symptoms. When ibuprofen is taken with certain products, its effects can intensify.
When taking liquid ibuprofen, a patient should shake the bottle well and use a marked medicine cup or measuring spoon to ensure accurate dosage. A pharmacist can provide the proper measuring device, states Drugs.com.
A patient who has overdosed on ibuprofen may experience shallow breathing, stomach pain, vomiting, and bloody or black stools. An overdose victim may also cough up blood and become drowsy, faint or comatose, states Drugs.com.