Most sinus infections are caused by viruses and resolve on their own within 7 to 10 days, so the first thing prescribed is usually symptom relief, not antibiotics. Only about 0.5 to 2 percent of acute sinus infections are bacterial. When bacteria are the cause, antibiotics may be appropriate, but even bacterial sinus infections can clear without them. What you’re prescribed depends on whether your infection is viral or bacterial, how long it’s lasted, and whether you have complicating factors.
Why Most Sinus Infections Don’t Need Antibiotics
Symptomatic therapy is the foundation of sinus infection treatment regardless of the cause. Because the vast majority of cases are viral, antibiotics won’t help and can cause unnecessary side effects. Current guidelines from the American Academy of Otolaryngology recommend that even when a bacterial infection is suspected, healthy patients can be observed for three to five days before starting antibiotics, since many improve on their own during that window.
A bacterial sinus infection is typically suspected when symptoms last longer than 10 days without improvement, when symptoms initially improve and then suddenly worsen (“double sickening”), or when symptoms are unusually severe from the start, with high fever and thick nasal discharge persisting for three or more consecutive days. Without these patterns, your provider will likely focus on managing your symptoms rather than reaching for a prescription antibiotic.
First-Line Antibiotics for Bacterial Cases
When antibiotics are warranted, amoxicillin-clavulanate is the standard first choice. The typical adult dose is 875 mg of amoxicillin with 125 mg of clavulanate, taken twice a day for 7 days. The clavulanate component helps the antibiotic work against bacteria that would otherwise resist amoxicillin alone.
A higher dose version exists for areas where antibiotic-resistant bacteria are more common. The Infectious Disease Society of America recommends using high-dose amoxicillin-clavulanate (2,000 mg of amoxicillin instead of 875 mg, twice daily) when the local rate of penicillin-resistant bacteria exceeds 10 percent. Your provider may also choose the higher dose if you’ve used antibiotics recently, have a weakened immune system, or have other risk factors for resistant infections. Treatment guidelines generally support 10 to 14 days for more complicated bacterial cases, particularly infections involving the sinuses behind the forehead or between the eyes, which carry a higher risk of serious complications if undertreated.
Alternatives if You’re Allergic to Penicillin
If you can’t take penicillin-based antibiotics, your provider has a few options. Doxycycline is a commonly used alternative that works well against the bacteria most often responsible for sinus infections. For patients who need a different class entirely, fluoroquinolone antibiotics like levofloxacin or moxifloxacin are effective but come with important caveats.
The FDA has specifically warned that fluoroquinolones carry risks that generally outweigh their benefits for acute sinusitis when other options exist. These risks include tendon damage, nerve problems, and other disabling side effects. Because of this, fluoroquinolones are reserved for patients who truly have no alternative. If your provider prescribes one, it usually means other antibiotics aren’t safe or effective options for your specific situation.
Nasal Steroid Sprays
Prescription nasal corticosteroid sprays are one of the most useful tools for sinus infection relief, whether the cause is viral or bacterial. They work by reducing the swelling inside your nasal passages, which helps your sinuses drain and speeds the clearing of infection. Common options include fluticasone, mometasone, and budesonide. These are sometimes prescribed alongside antibiotics in bacterial cases, or as a standalone treatment for viral infections.
The theory is straightforward: swollen sinus passages trap mucus and bacteria. By shrinking that swelling, steroid sprays restore airflow and drainage, which helps your body eliminate the infection naturally. They also reduce the inflammation that causes much of the facial pressure and pain. Several of these sprays are now available over the counter, but your provider may prescribe specific dosing, such as mometasone 200 micrograms once or twice daily, depending on the severity of your symptoms.
Symptom Relief Medications
Regardless of whether you receive an antibiotic, symptom management makes a real difference in how you feel during recovery. Your provider may recommend a combination of the following:
- Expectorants like guaifenesin thin out thick mucus so it drains more easily. The standard adult dose is 200 to 400 mg every four hours for short-acting forms, or 600 to 1,200 mg every twelve hours for extended-release tablets.
- Nasal decongestant sprays like oxymetazoline provide fast relief from congestion by shrinking swollen blood vessels in the nose. However, manufacturers recommend using them for no longer than one week. Beyond that, you risk rebound congestion, a condition where your nasal passages become more swollen than before you started the spray.
- Oral decongestants like pseudoephedrine can reduce congestion without the rebound risk of nasal sprays, though they can raise blood pressure and aren’t suitable for everyone.
- Saline irrigation using a neti pot or squeeze bottle flushes mucus and irritants from your sinuses. It has no side effects and is recommended as a baseline treatment in nearly all sinus infection cases.
- Pain relievers like ibuprofen or acetaminophen help with the facial pain, pressure, and headache that often accompany sinus infections.
Treatments for Chronic Sinus Infections
Chronic sinusitis, defined as symptoms lasting 12 weeks or longer, follows a different treatment path. Long-term management typically starts with daily saline irrigation and prescription nasal steroid sprays. When these don’t provide enough control, your provider may recommend endoscopic sinus surgery to open blocked passages and improve drainage.
For people with chronic sinusitis and nasal polyps who don’t respond to standard treatments, a newer class of medications called biologics has changed the landscape. Three biologics targeting the specific type of inflammation behind nasal polyps are now FDA-approved: dupilumab, mepolizumab, and omalizumab. These are injectable medications used as add-on maintenance therapy for adults whose polyps remain poorly controlled. Among the three, dupilumab has shown the strongest results across multiple measures, including improvement in smell, quality of life, reduced need for oral steroids, and reduced need for repeat surgery. Biologics may be prioritized over surgery for patients who’ve had polyps return within 12 months of a previous procedure, who have moderate to severe asthma alongside their sinus disease, or who can’t undergo general anesthesia.