Allfen is a commonly used over-the-counter medication that provides relief from symptoms associated with allergies, colds, and sinus congestion. The active ingredient in Allfen is pseudoephedrine, which works by narrowing the blood vessels in the nasal passages, reducing swelling and congestion.

Allfen is typically taken orally in the form of a tablet or liquid, and should be taken as directed on the packaging or as advised by a healthcare provider. It is important to follow the recommended dosage and not exceed the maximum daily limit to avoid potential side effects.

Some common side effects of Allfen may include dizziness, headache, nausea, and trouble sleeping. If you experience any severe side effects such as rapid heartbeat, difficulty breathing, or chest pain, it is important to seek medical attention immediately.

It is important to note that Allfen should not be used by individuals with certain medical conditions such as high blood pressure, heart disease, or thyroid disorders, as it may exacerbate these conditions. Additionally, Allfen should not be taken by individuals who are pregnant or breastfeeding without consulting a healthcare provider.

Overall, Allfen can be an effective and convenient option for relieving symptoms of allergies, colds, and sinus congestion. However, it is important to use this medication responsibly and consult a healthcare provider if you have any concerns or questions about its use.