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Expired aspirin is aspirin that is past the expiration date printed on the container. According to Bayer Healthcare LLC, using aspirin or any over-the-counter drug past the expiration date is not recommended as its effectiveness may be diminished.


Expired drugs, such as aspirin, are safe to take in most situations, although they may not be as effective, according to Drugs.com. Patients should replace expired drugs as soon as possible if they take the medication for a heart condition or another chronic medical problem.


The main ingredient in aspirin is salicylic acid, says CNN. Salicylic acid is found in shrubs and plants, such as jasmine, peas, beans and clover along with some grasses and trees.


Dogs can be given small doses of aspirin under certain conditions and with supervision from a licensed veterinarian. Dogs do not metabolize aspirin the same way humans do and are more prone to adverse effects from the drug.


Aspirin is the generic name for acetylsalicylic acid. Aspirin is a nonsteroidal anti-inflammatory drug (NSAID) sold under many brand names in sizes ranging from 81 to 500 milligrams, according to MedicineNet.


Consumers can use expired ibuprofen, but the potency of ibuprofen cannot be guaranteed by the manufacturer after the expiration date. Many medications are safe for use up to one year after they expire, but it varies with environmental conditions, according to Drugs.com.


Dogs may be given aspirin for injuries or other short-term health issues, according to WedMD. Long-term use of aspirin by dogs is considered risky and can cause increased bleeding, which is due to its blood-thinning properties.


Plant extracts containing the active ingredient in aspirin have been used medicinally since at least 400 B.C., but the modern drug known as aspirin was first developed and patented by Bayer, a German pharmaceutical company. Bayer coined and trademarked the name "Aspirin."


Common side effects of aspirin include heartburn, irritation of the stomach or intestines, stomach cramps, and vomiting, according to WebMD. Rarer side effects include stomach or intestinal bleeding, anemia, drowsiness, hives, and bronchospasm. Some patients also experience a mild skin rash or loss


A regular aspirin tablet contains 325 milligrams of aspirin as the active ingredient. Inactive ingredients include cornstarch, hypromellose, powdered cellulose and triacetin and may include carnauba wax, according to Drugs.com. Some manufacturers use the name acetylsalicylic acid, another name for a