Most sinus infections are treated with over-the-counter remedies, not antibiotics. About 70% of sinus infections clear up on their own within two weeks, so the typical approach focuses on managing symptoms while your body fights off the infection. If your doctor determines bacteria are involved, antibiotics may be prescribed, but that’s less common than most people expect.
Why Most Sinus Infections Don’t Need Antibiotics
The majority of sinus infections start as viral infections, meaning antibiotics won’t help. Even many bacterial sinus infections resolve without them. Antibiotic therapy doesn’t necessarily shorten how long you feel sick or reduce the risk of complications in adults.
Doctors use three specific criteria to decide if bacteria are likely the cause. You probably have a bacterial sinus infection if your symptoms have lasted more than 10 days without improving, if you develop a high fever (over 102°F) with thick discolored nasal discharge or facial pain lasting 3 to 4 days at the start of the illness, or if your symptoms improve and then suddenly get worse again within the first 10 days. If none of those apply, you’re almost certainly dealing with a virus, and the treatment plan is symptom relief.
Antibiotics for Bacterial Sinus Infections
When antibiotics are warranted, amoxicillin or amoxicillin-clavulanate is the standard first choice. A typical course runs 5 to 7 days, though some doctors prescribe 7 to 10 days. Recent guidelines from the American Academy of Otolaryngology suggest the shorter course is often equally effective with fewer side effects, so it’s worth asking about.
If you’re allergic to penicillin, doxycycline is the go-to alternative. Patients who can tolerate cephalosporins (a related class of antibiotics) have a few additional options. Stronger antibiotics called fluoroquinolones are reserved as a last resort because their risk of serious side effects generally outweighs the benefits for a sinus infection.
Steroid Nasal Sprays
Prescription or over-the-counter steroid nasal sprays are one of the most effective treatments for sinus infections, whether viral or bacterial. These sprays reduce swelling inside the nasal passages, which helps your sinuses drain and clears out the organisms causing the infection. Common options include fluticasone (Flonase), mometasone (Nasonex), and budesonide (Rhinocort).
A Cochrane review combining results from multiple trials found that people using steroid nasal sprays were more likely to see their symptoms improve or resolve compared to placebo, with about 73% improving versus 66% on placebo. Higher doses showed a stronger effect. These sprays work both as a standalone treatment and alongside antibiotics when those are prescribed.
Decongestants
Decongestants shrink swollen blood vessels in your nasal passages, opening up airflow. They come in two forms, and the distinction matters. Oral decongestants (like pseudoephedrine, sold as Sudafed) can be taken for longer stretches. Nasal spray decongestants (like oxymetazoline, sold as Afrin) work faster but should not be used for more than one week. Using spray decongestants longer than that can cause rebound congestion, a condition called rhinitis medicamentosa, where the spray itself starts making your stuffiness worse.
Pain Relievers
For the facial pressure, headache, and pain that come with a sinus infection, acetaminophen (Tylenol) or ibuprofen (Advil, Motrin) both work well. One important caution: many combination cold and flu medicines already contain acetaminophen. If you’re taking one of those products, check the label before adding a separate dose of Tylenol, because too much acetaminophen can cause liver damage.
Mucus-Thinning Medication
Guaifenesin (Mucinex) is an expectorant that thins mucus so it drains more easily from your sinuses, throat, and lungs. It won’t stop the infection, but it can make thick, sticky congestion more manageable and help you clear it out faster. It’s available over the counter and is often combined with other cold medications in multi-symptom products.
Saline Nasal Rinses
Rinsing your sinuses with a saltwater solution using a neti pot or squeeze bottle is one of the simplest and most helpful things you can do. It physically flushes out mucus, bacteria, and inflammatory debris. You can buy pre-made saline packets or mix your own.
The water you use matters. The CDC recommends using store-bought water labeled “distilled” or “sterile.” Tap water is fine if you boil it at a rolling boil for one minute first (three minutes above 6,500 feet elevation), then let it cool before use. Never rinse your sinuses with untreated tap water. Rare but dangerous infections have occurred from organisms found in unboiled water.
What to Expect During Recovery
If you’re managing a viral sinus infection with OTC remedies, expect gradual improvement over one to two weeks. The worst symptoms, particularly congestion and facial pressure, often peak around days 3 to 5 and then slowly ease. If you’ve been prescribed antibiotics for a bacterial infection, you should notice improvement within 2 to 3 days of starting them. If your symptoms aren’t improving after that window, or if they get rapidly worse at any point, contact your doctor. Worsening symptoms can occasionally signal complications involving the eyes or nervous system that need more aggressive treatment.