Get emergency medical help if you have any of these signs of an allergic reaction to Sudafed: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Stop using Sudafed and call your doctor at once if you have a serious side effect such as:
fast, pounding, or uneven heartbeat;
severe dizziness or anxiety;
easy bruising or bleeding, unusual weakness, fever, chills, body aches, flu symptoms; or
dangerously high blood pressure (severe headache, blurred vision, ringing in your ears, anxiety, confusion, chest pain, trouble breathing, uneven heart rate, seizure).
Less serious Sudafed side effects may include:
loss of appetite;
warmth, tingling, or redness under your skin;
feeling restless or excited (especially in children);
sleep problems (insomnia); or
skin rash or itching.
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.
 Sudafed Congestion side effects (more detail)
