Do You Need Antibiotics for a Sinus Infection? A Nurse Practitioner Explains

Written by Naurah Gaspard, DNP, FNP-C, FNP-BC · Medically reviewed by Cherlie Joseph, MSN, FNP-BC · Updated November 2026

Usually not. Most sinus infections are caused by viruses and improve on their own in 7 to 10 days. Antibiotics help when symptoms last more than 10 days without improving, get worse after first getting better, or start out severe with a high fever.

Viral vs bacterial sinus infection

Your sinuses are air-filled spaces around your nose and eyes. When they swell, usually after a cold, mucus gets trapped and you feel pressure and congestion. More than 9 out of 10 sinus infections in adults are viral. Thick yellow or green mucus by itself does not mean you need antibiotics; color comes from your immune system at work.

The 3 signs a sinus infection may be bacterial

1. It lasts more than 10 days without getting better.
2. “Double worsening”: you start to improve, then get worse again.
3. It starts severe: fever of 102°F or higher with thick nasal discharge or facial pain for 3 to 4 days in a row.

If one of these fits, an antibiotic such as amoxicillin-clavulanate may help. If none fit, antibiotics add side effects without speeding recovery.

Relief that actually works

• Saline rinse or spray (use distilled or boiled-then-cooled water in rinse bottles).
• Steroid nasal spray such as fluticasone can reduce swelling.
• Steam from a warm shower, plus plenty of fluids.
• Pain relievers like acetaminophen or ibuprofen, as directed on the label.
• Decongestants for a few days only; check with a provider if you have high blood pressure.

How online sinus care works

In an online visit, your nurse practitioner asks how long you've been sick, how symptoms have changed, your temperature and your medical history. That timeline is what separates viral from bacterial sinusitis, so it works very well online. You get a written plan, and a prescription when it's truly needed.

Florida allergies and sinus problems

In Florida, pollen season can last most of the year, and allergies are a common trigger for repeat sinus trouble. If you get “sinus infections” every few months, treating allergies with a daily nasal steroid or antihistamine may prevent them.

Frequently asked questions

How long does a sinus infection last?

Viral sinus infections usually improve within 7 to 10 days. Symptoms lasting longer than 10 days, or that worsen after improving, should be checked.

Can a nurse practitioner prescribe antibiotics for a sinus infection online?

Yes. In Florida, a licensed nurse practitioner can evaluate sinus symptoms through telehealth and prescribe an antibiotic when it is medically appropriate.

Is green mucus a sign I need antibiotics?

No. Mucus color alone does not tell viral from bacterial infection. How long you've been sick and whether you're getting worse matter more.

Sources

• IDSA: Acute bacterial rhinosinusitis guideline
• CDC: Sinus infection

Keep reading

• UTI Treatment Online in Florida: Can You Get Antibiotics Without an Office Visit?
• Online Prescription Refill in Florida: Which Medicines Can Be Refilled and How

This article is for general education and is not a substitute for medical advice. Treatment, including any prescription, is decided by a licensed provider after reviewing your health history. OurTopClinic is not for emergencies; if you have a medical emergency, call 911. OurTopClinic serves adults located in Florida, New Mexico, Oregon and Washington. Learn more at ourtopclinic.com.