Most sinus infections are viral, which means antibiotics won’t help. The best medicine depends on whether your infection is bacterial or viral, but for the majority of people, a combination of over-the-counter treatments will relieve symptoms effectively while the infection clears on its own. When antibiotics are needed, amoxicillin-clavulanate is the standard first choice.
Most Sinus Infections Don’t Need Antibiotics
Up to 98% of sinus infections start as viral illnesses, essentially a cold that inflames the sinus passages. These resolve without antibiotics, typically within 7 to 10 days. Taking antibiotics for a viral sinus infection won’t speed your recovery, and it contributes to antibiotic resistance.
A bacterial sinus infection is more likely if your symptoms last longer than 10 days without improving, if they get significantly worse after initially getting better (sometimes called “double worsening”), or if you develop a high fever alongside thick, colored nasal discharge and facial pain. Green or yellow mucus alone doesn’t confirm a bacterial infection, but the combination of colored discharge with disrupted sleep and moderate-to-severe symptoms does tilt the odds toward one.
When Antibiotics Are the Right Call
If your doctor determines you have a bacterial sinus infection, amoxicillin-clavulanate is the first-line antibiotic. It pairs amoxicillin (which kills bacteria) with clavulanate (which prevents bacteria from breaking down the amoxicillin). A standard adult course is typically 875 mg twice daily or 500 mg three times daily for 5 to 10 days, depending on your doctor’s judgment.
If you’re allergic to penicillin, several alternatives exist. For mild allergies, options include certain other antibiotic classes your doctor can select from. For serious penicillin allergies, azithromycin or clarithromycin are commonly prescribed instead. If a first course of antibiotics doesn’t work, your doctor may switch to a broader-spectrum option.
Over-the-Counter Pain Relievers
Sinus pressure and facial pain are often the most miserable part of a sinus infection. Both ibuprofen (Advil, Motrin) and acetaminophen (Tylenol) are effective at relieving this pain. Ibuprofen has the added benefit of reducing inflammation, which can help with swelling in the sinus passages. You can alternate between the two if one alone isn’t enough, since they work through different mechanisms and don’t interact with each other.
Nasal Steroid Sprays
Steroid nasal sprays like fluticasone (Flonase) are one of the most effective tools for sinus infections, and they’re available without a prescription. They work by reducing the swelling inside your nasal passages, which helps your sinuses drain and clears congestion. In clinical trials, fluticasone used once daily significantly reduced the three hallmark symptoms of sinusitis: nasal congestion, sinus headache and facial pressure, and postnasal drip, compared to placebo.
These sprays take a day or two to reach full effect, so don’t expect instant relief. They’re safe to use for the full duration of your sinus infection and are worth starting early. Unlike decongestant sprays, they carry no risk of rebound congestion.
Decongestants: Choose Carefully
Oral decongestants can open up clogged nasal passages, but the two common options on pharmacy shelves are not equally effective. Pseudoephedrine (Sudafed) significantly improves nasal congestion, while phenylephrine, the ingredient in most decongestants you can grab off the shelf without asking, performed no better than a sugar pill in controlled studies. If you want an oral decongestant that actually works, you’ll need to ask for pseudoephedrine at the pharmacy counter (it’s kept behind the counter in most states but doesn’t require a prescription).
Decongestant nasal sprays like oxymetazoline (Afrin) provide fast, powerful relief but should not be used for more than 3 days. Beyond that, they can cause rebound congestion, where your nose becomes more blocked than before you started using the spray. Use them strategically for the worst days, not as a daily treatment.
Saline Rinses
Rinsing your sinuses with salt water using a neti pot or squeeze bottle physically flushes out mucus, bacteria, and inflammatory debris. It’s one of the simplest and most consistently recommended treatments for sinus infections of any type. Many people find it provides immediate, if temporary, relief from congestion and pressure.
The critical safety point: never use tap water. Tap water can contain trace organisms that are harmless if swallowed but potentially dangerous when introduced directly into your sinuses. Use distilled water (labeled “distilled” on the bottle), water you’ve boiled and cooled, or water passed through a CDC-approved filter. Pre-mixed saline packets are widely available and take the guesswork out of getting the salt concentration right.
Antihistamines: Only If Allergies Are Involved
If your sinus infection was triggered by allergies, antihistamines like cetirizine (Zyrtec) or loratadine (Claritin) can reduce the underlying allergic inflammation feeding the problem. Antihistamine nasal sprays can also help with symptoms like a runny nose, even in some non-allergic cases.
If allergies aren’t part of the picture, oral antihistamines generally won’t help and may actually thicken your mucus, making drainage harder. Don’t reach for them by default.
A Practical Treatment Plan
For most people with a sinus infection, the most effective approach combines several of these treatments rather than relying on a single “best” medicine:
- Fluticasone nasal spray once daily to reduce sinus swelling
- Saline rinses once or twice daily to flush mucus
- Ibuprofen or acetaminophen as needed for pain and pressure
- Pseudoephedrine (from behind the pharmacy counter) if congestion is severe
- Oxymetazoline spray for up to 3 days if you need fast relief for sleep or work
If your symptoms last beyond 10 days, worsen after improving, or include a high fever, that’s when antibiotics enter the picture. Seek immediate care if you notice swelling or redness around your eyes, double vision, confusion, or a stiff neck, as these can signal a sinus infection spreading beyond the sinuses.