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.

Since your runny nose has lasted a week, it may be due to an allergy or a viral cold. Allegra and Fevryl can help with symptoms, but if the runny nose persists beyond 7 to 10 days, is worsening, or comes with fever or green/yellow discharge, you should see a doctor to rule out infection or other causes. Meanwhile, continue hydration, saline nasal washes, and avoiding triggers.

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.

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.