Yes, taking Montair LC (which contains montelukast and levocetirizine) 12 hours before your Pulmonary Function Test (PFT) can affect the results. This medication helps relax your airways, which might make your lung function appear better than it typically is without treatment. To get the most accurate baseline assessment of your lungs, doctors usually recommend holding this medication for at least 24 hours before the test. Please don't worry, but do let your testing technician or doctor know that you took a dose 12 hours prior, so they can interpret your results accurately or safely reschedule if needed.

Since your nasal endoscopy was normal?which is very reassuring?your ongoing ear pressure, crawling sensation, and jaw pain may not be sinus-related. Instead, they could stem from Eustachian tube dysfunction or Temporomandibular Joint (TMJ) issues, where jaw tension affects the ear nerves. Since medications like Montair LC and Avamys haven't fully resolved this, I gently recommend consulting your ENT specialist to evaluate your Eustachian tube directly, or a dental specialist to check for TMJ dysfunction. In the meantime, applying warm compresses to your jaw may offer some comforting relief.

Since Reswas LS, Montair LC, and azithromycin have not brought relief, your cough might be triggered by non-infectious causes such as acid reflux, post-nasal drip, or cough-variant asthma. I recommend consulting your doctor to explore these possibilities; they may suggest a trial of inhaled corticosteroids or acid-reducing medications. In the meantime, home remedies like steam inhalation and warm fluids can help soothe your throat. Please avoid starting new medications without a doctor's guidance.

It is not safe to take Montair LC (montelukast and levocetirizine) without a doctor's prescription. Fortunately, you will not develop a physical tolerance or become dependent on this medication. Since Montair 10mg did not provide enough relief, other effective, non-addictive options to discuss with your doctor include generic daily antihistamines like fexofenadine or cetirizine, or daily nasal corticosteroid sprays like fluticasone. Please consult a healthcare professional to safely find the best treatment plan to help you breathe easier.

Since your cold and breathing difficulties have lasted ten days despite taking Sero-flow, Montair LC, and doxycycline, it is very important to consult your doctor for a re-evaluation. Doxycycline is an antibiotic and won't treat viral infections, and your breathing issues may need an adjustment in your treatment plan. Please seek immediate medical care if you experience severe shortness of breath, chest pain, or a high fever. Rest up, stay hydrated, and let a healthcare professional take a closer look to help you feel better soon.

I understand you are very concerned about your grandfather. While atorvastatin and Olmy D (olmesartan) can sometimes cause side effects like mild fatigue or dizziness from low blood pressure, his sudden extreme weakness, sweating, and shortness of breath after walking just a few steps are serious symptoms. These could indicate an underlying heart issue rather than just medication side effects. Please do not alter or stop his medications on your own. Because these symptoms require urgent evaluation, please seek immediate emergency medical care for him so a physician can evaluate his heart and safely adjust his treatment.