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Pheniramine / phenylephrine Side Effects

Applies to pheniramine / phenylephrine: oral tablet.


Do not use the medicine to make a child sleepy. Misuse of this medicine may cause death in very young children.

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Stop using this medicine and call your doctor at once if you have:

Common side effects may include:

  • drowsiness;

  • feeling restless or excited (especially in children);

  • dry mouth, nose, or throat;

  • constipation; or

  • blurred vision, double vision.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.

For Healthcare Professionals

Applies to pheniramine/phenylephrine: oral tablet.


The manufacturer has not provided adverse event information.[Ref]


1. "Product Information. Alahist D (pheniramine-phenylephrine)." Poly Pharmaceuticals Inc (2020):

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.