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Generic name:
Brand names: Halfprin, Genuine Bayer, Ecotrin, Empirin, Aspirin

Why is Halfprin prescribed?

Halfprin is an anti-inflammatory pain medication (analgesic) that is used to relieve headaches, toothaches, and minor aches and pains, and to reduce fever. It also temporarily relieves the minor aches and pains of arthritis, muscle aches, colds, flu, and menstrual discomfort. In some patients, a small daily dose of aspirin may be used to ensure sufficient blood flow to the brain and prevent stroke. Halfprin may also be taken to decrease recurrence of a heart attack or other heart problems.

Most important fact about Halfprin

Halfprin should not be used during the last 3 months of pregnancy unless specifically prescribed by a doctor. It may cause problems in the unborn child or complications during delivery.

How should you take Halfprin?

Do not take more than the recommended dose.

Do not use aspirin if it has a strong, vinegar-like odor.

If aspirin upsets your stomach, use of a coated or buffered brand may reduce the problem.

Do not chew or crush sustained-release brands, such as Bayer time-release aspirin, or pills coated to delay breakdown of the drug, such as Ecotrin. To make them easier to swallow, take them with a full glass of water.

--If you miss a dose...

Take it as soon as you remember. If it is almost time for your next dose, skip the one you missed and go back to your regular schedule. Never take 2 doses at the same time.

--Storage instructions...

Store at room temperature.

What side effects may occur?

Side effects cannot be anticipated. If any develop or change in intensity, inform your doctor as soon as possible. Only your doctor can determine if it is safe for you to continue using aspirin.

  • More common side effects may include:
    Heartburn, nausea and/or vomiting, possible involvement in formation of stomach ulcers and bleeding, small amounts of blood in stool, stomach pain, stomach upset

Why should Halfprin not be prescribed?

Do not take aspirin if you are allergic to it, if you have asthma, ulcers or ulcer symptoms, or if you are taking a medication that affects the clotting of your blood, unless specifically told to do so by your doctor.

Special warnings about Halfprin

Halfprin should not be given to children or teenagers for flu symptoms or chickenpox. Halfprin has been associated with the development of Reye"s syndrome, a dangerous disorder characterized by disorientation, and lethargy leading to coma.

If you have a continuous or high fever, or a severe or persistent sore throat, especially with a high fever, vomiting and nausea, consult your doctor. It could indicate a more serious illness.

If pain persists for more than 10 days or if redness or swelling appears at the site of inflammation, consult your doctor immediately.

If you experience ringing in the ears, hearing loss, upset stomach, or dizziness, consult your doctor before taking more aspirin.

Check with your doctor before giving aspirin for arthritis or rheumatism to a child under 12.

Possible food and drug interactions when taking Halfprin

If aspirin is taken with certain other drugs, the effects of either could be increased, decreased, or altered. It is especially important to check with your doctor before combining aspirin with the following:

Acetazolamide (Diamox)
ACE-inhibitor-type blood pressure medications such as Capoten
Anti-gout medications such as Zyloprim
Arthritis medications such as Motrin and Indocin
Blood thinners such as Coumadin
Certain diuretics such as Lasix
Diabetes medications such as DiaBeta and Micronase
Diltiazem (Cardizem)
Dipyridamole (Persantine)
Seizure medications such as Depakene
Steroids such as prednisone

Special information if you are pregnant or breastfeeding

The use of aspirin during pregnancy should be discussed with your doctor. Halfprin should not be used during the last 3 months of pregnancy unless specifically indicated by your doctor. It may cause problems in the fetus and complications during delivery. Halfprin may appear in breast milk and could affect a nursing infant. Ask your doctor whether it is safe to take aspirin while you are breastfeeding.

Recommended dosage


Treatment of Minor Pain and Fever

The usual dose is 1 or 2 tablets every 3 to 4 hours up to 6 times a day.

Prevention of Stroke

The usual dose is 1 tablet 4 times daily or 2 tablets 2 times a day.

Prevention of Heart Attack

The usual dose is 1 tablet daily. Your physician may suggest that you take a larger dose, however. If you use Halfprin low-strength tablets (162 milligrams), adjust dosage accordingly.


Consult your doctor.


Any medication used in excess can have serious consequences. If you suspect symptoms of an aspirin overdose, seek medical treatment immediately.

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