Allegra M Tablet is a combination medicine that is commonly used to treat allergy symptoms such as runny nose, stuffy nose, sneezing, watery eyes, and congestion or stuffiness. It contains two active ingredients: Fexofenadine and Montelukast.It is important to take Allegra M Tablet exactly as prescribed by your doctor. The dosage and duration of the treatment will depend on your medical condition and how you respond to the medication. Do not stop taking this medicine without consulting your doctor, as stopping the medication too early may cause your symptoms to return or worsen.You should inform your healthcare provider about all the other medications you are taking, including over-the-counter medications, vitamins, and herbal supplements. Some medicines may affect the effectiveness of Allegra M Tablet, or may cause unwanted side effects when taken with this medication.The most common side effects of Allegra M Tablet include nausea, diarrhea, vomiting, skin rash, flu-like symptoms, and headache. These side effects are usually temporary and should resolve with time. If you experience any side effects that concern you, contact your healthcare provider immediately.It is important to note that Allegra M Tablet may cause dizziness and drowsiness. Therefore, it is advisable to avoid activities that require mental alertness such as driving or operating heavy machinery until you know how this medicine affects you. Additionally, avoid consuming alcohol while taking this medication as it may worsen the dizziness and drowsiness.Do not share your medication with others or use it for any condition not prescribed by your doctor. It is recommended to drink plenty of fluids while taking this medication. If you have liver or kidney disease, make sure to inform your doctor before taking Allegra M Tablet. Also, if you are pregnant, planning pregnancy or breastfeeding, discuss with your doctor before starting the medication.