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Synalgos DC

Side Effects


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

Read the Synalgos DC (aspirin, caffeine, and dihydrocodeine bitartrate capsules, usp) Side Effects Center for a complete guide to possible side effects


The CNS-depressant effects of Synalgos-DC may be additive with that of other CNS depressants. See “WARNINGS.” Aspirin may enhance the effects of anticoagulants and inhibit the uricosuric effects of uricosuric agents.

Geriatric Use

Clinical studies of Synalgos-DC did not include sufficient numbers of subjects aged 65 and over to determine whether elderly subjects respond differently from younger subjects.

In general, dose selection for an elderly patient should be cautious, starting at the low end of the dosing range, reflecting the greater frequency of decreased hepatic, renal, or cardiac function, and of concomitant disease or other drug therapy.

Last reviewed on RxList: 6/4/2013
This monograph has been modified to include the generic and brand name in many instances.

Side Effects

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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