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Synalgos DC

Synalgos-DC Side Effects Center

Medical Editor: John P. Cunha, DO, FACOEP

Synalgos-DC (aspirin, caffeine, and dihydrocodeine bitartrate) is a combination of an analgesic, a narcotic pain reliever, and caffeine, which increases the effects of aspirin, used to treat moderate to moderately severe pain. Common side effects include lightheadedness, dizziness, drowsiness, sedation, nausea, vomiting, constipation, itching, and skin reactions.

The usual adult dose of Synalgos-DC is two capsules every 4 hours as needed for pain. Synalgos-DC may interact with other CNS depressants, anticoagulants, and uricosuric agents. Tell your doctor all medications and supplements you use. Synalgos-DC is not recommended for use during pregnancy. It may harm a fetus and interfere with normal labor/delivery. Dihydrocodeine passes into breast milk and can have adverse effects on nursing infants. Aspirin and caffeine are also excreted in breast milk in small amounts. Consult your doctor before breastfeeding. Withdrawal symptoms may occur if you suddenly stop taking this medication.

Our Synalgos-DC (aspirin, caffeine, and dihydrocodeine bitartrate) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What is Prescribing information?

The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.

Synalgos-DC FDA Prescribing Information: Side Effects
(Adverse Reactions)


The most frequently observed reactions include lightheadedness, dizziness, drowsiness, sedation, nausea, vomiting, constipation, pruritus, and skin reactions.

Read the entire FDA prescribing information for Synalgos-DC (Aspirin, Caffeine, and Dihydrocodeine Bitartrate Capsules, USP) »


Report Problems to the Food and Drug Administration


You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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