Allegra is usually safe to take once daily for several days to weeks for allergic rhinitis. For a common cold, it can help with a runny nose and sneezing, but it won't cure the infection. If symptoms last more than 1 to 2 weeks, or if you need it continuously, consult your doctor to check the cause and ensure it is safe for you to continue.

For allergies causing a runny nose, watery eyes, and nasal blockage, the best approach is to avoid triggers like dust, pollen, smoke, and pets. Using antihistamine tablets or nasal sprays as prescribed by a doctor can relieve symptoms, and saline nasal washes help clear the nose. In long-term or severe cases, allergy testing and immunotherapy (allergy shots or drops) may provide lasting relief.

Allergo 180 mg tablet fexofenadine usually does not interact significantly with alcohol. However, alcohol may increase the risk of drowsiness, dizziness, or reduced alertness in some people. It is safest to limit or avoid alcohol while taking this medicine.

Your symptoms suggest that you may be having an allergy or airway sensitivity triggered by dust, perfumes, smoke, or strong smells. These triggers can irritate the nose and breathing passages, leading to symptoms such as cough, sneezing, nasal blockage, breathing difficulty, and cold-like symptoms. In some people, this may be related to allergic rhinitis or mild asthma. The most important step is to avoid or reduce exposure to the substances that trigger your symptoms as much as possible. Try to keep your surroundings clean and dust-free by regularly cleaning bedsheets, curtains, pillows, carpets, and fans, as dust tends to collect in these areas. Wearing a mask while cleaning or when going to dusty places may help reduce exposure. Avoid strong perfumes, room fresheners, incense smoke, cigarette smoke, and other strong odours that worsen your breathing. Keeping windows open for ventilation and using clean air circulation may also help. Drinking enough water and using steam inhalation can sometimes reduce nasal blockage and irritation. If your symptoms occur frequently, a doctor may suggest anti-allergy medicines, nasal sprays, or inhalers depending on the severity of the problem. Do not ignore repeated breathing difficulty, wheezing, chest tightness, or night-time cough, as these symptoms may indicate asthma and need proper medical evaluation. Allergy testing may also help identify the exact triggers. Regular exercise, proper sleep, and avoiding smoking can also improve overall lung health and reduce allergy flare-ups over time

Since you have a blocked artery, it is important to be careful with medicines for cold and cough. Most over-the-counter decongestants can raise blood pressure or affect the heart, so they may not be safe. You should consult your doctor or cardiologist before taking anything. In the meantime, you can safely use paracetamol for pain or fever, warm fluids, steam inhalation, and saline nasal sprays to relieve symptoms.