What to Take If You Have a Sinus Infection

Most sinus infections are caused by viruses, not bacteria, which means the most effective things to take are the same remedies you would reach for during a bad cold: pain relievers, decongestants, and saline rinses. Antibiotics only enter the picture when symptoms persist beyond about ten days or take a noticeable turn for the worse after initially improving. That distinction matters more than most people realize, because the treatment decisions you make in the first week or so shape how quickly you recover and whether you end up taking medication you never needed.

How to Tell Whether You Actually Need Antibiotics

The single most important question when deciding what to take is whether your sinus infection is viral or bacterial. Clinical guidelines draw a clear line: a bacterial sinus infection should be suspected when symptoms last ten or more days past the start of an upper respiratory infection, or when symptoms improve and then get noticeably worse again within ten days (sometimes called “double worsening”).¹ If you are on day four with thick green mucus and facial pressure, that is almost certainly still a virus doing its thing. Green or yellow mucus alone does not mean bacteria are involved.

Most viral sinus infections resolve on their own within seven to ten days. During that stretch, your job is symptom management. If you jump to antibiotics too early, you expose yourself to side effects and contribute to resistance without speeding up recovery. Acute sinusitis is already one of the conditions with the highest rate of antibiotic prescribing in adults under 65, and much of that prescribing happens before the infection has had a fair chance to clear on its own.²

Over-the-Counter Pain Relievers

Facial pain, pressure behind the eyes, and sinus headaches are the symptoms that send most people searching for help. Standard over-the-counter pain relievers like ibuprofen and acetaminophen work well here. Ibuprofen has the added benefit of reducing inflammation, which can help with swelling around the sinuses. Acetaminophen is a reasonable alternative if you cannot take anti-inflammatory drugs. Neither will shorten the infection, but they can make the wait far more bearable.

Oral Decongestants and the Phenylephrine Problem

Decongestants shrink swollen tissue in the nasal passages, helping mucus drain and making it easier to breathe. But which one you grab off the shelf matters enormously. Most over-the-counter cold and sinus products sold in the United States contain phenylephrine as their decongestant, and the evidence that oral phenylephrine actually works is remarkably weak. In a controlled study using an allergen challenge, phenylephrine was not significantly different from placebo in relieving nasal congestion over a six-hour period, while pseudoephedrine was significantly more effective than both placebo and phenylephrine.³ A systematic review of adult studies reached the same conclusion: oral phenylephrine repeatedly failed to outperform placebo, while pseudoephedrine consistently showed meaningful improvement.⁴

Pseudoephedrine is the decongestant that actually works, but it is kept behind the pharmacy counter in the U.S. because it can be used to manufacture methamphetamine. You can still buy it without a prescription in most states; you just need to ask the pharmacist and show identification. If you have been buying a sinus product off the regular shelf and wondering why it barely helps, the phenylephrine inside is the likely culprit. Pseudoephedrine can raise blood pressure and cause jitteriness, so it is not ideal for everyone, but for most people it provides noticeably better relief.

Nasal Spray Decongestants

Topical decongestant sprays like oxymetazoline (the active ingredient in products like Afrin) deliver relief almost immediately. They work directly on the swollen nasal tissue rather than traveling through your bloodstream, so they tend to feel more powerful than oral options. The standard advice is to limit use to three to five days to avoid “rebound congestion,” a phenomenon where stopping the spray makes your nose more stuffed up than before you started.

The rebound story is real, but the evidence is more nuanced than the packaging suggests. One study found evidence of increased baseline congestion after just three days of use, though the spray’s vehicle solution (the inactive liquid the drug is dissolved in) may have contributed to that effect.⁵ On the other hand, a study using oxymetazoline three times daily for four full weeks in healthy subjects found no rebound congestion and no loss of the drug’s effectiveness over that period.⁶ Another study found that limiting oxymetazoline to a single nightly dose for four weeks produced no adverse effects, though most participants did notice temporary stuffiness a few hours before their evening dose, which resolved quickly if they stopped using the spray.⁷

The practical takeaway: a few days of oxymetazoline during the worst stretch of a sinus infection is unlikely to cause problems. Using it once or twice a day is probably safer than spraying every four hours. If you have a history of overusing nasal sprays, stick to saline rinses instead.

Saline Nasal Irrigation

Rinsing your sinuses with salt water is one of the most consistently recommended treatments for sinus infections, whether viral or bacterial. It physically flushes out mucus, inflammatory debris, and irritants. Neti pots, squeeze bottles, and powered irrigation devices all accomplish the same basic goal.

Isotonic saline (matching your body’s salt concentration) is the gentlest option and the safest for regular use. Hypertonic saline, which has a higher salt concentration, may draw out more fluid from swollen tissue but can cause irritation and mucosal cell damage in some people.⁸ Clinical recommendations favor isotonic or hypertonic solutions in the range of roughly two to three and a half percent salt concentration, and they emphasize cleaning the device thoroughly between uses to prevent introducing new bacteria into your sinuses.⁹ Always use distilled, sterile, or previously boiled water. Tap water can contain organisms that are harmless in your gut but dangerous inside your sinuses.

Guaifenesin and Thinning the Mucus

Guaifenesin, sold as Mucinex and many generic equivalents, loosens mucus in the airways and makes coughs more productive. Clinical evidence supports its usefulness in respiratory conditions involving excess mucus, including upper respiratory tract infections and possibly rhinosinusitis.¹⁰ If thick, sticky mucus is a major part of your misery, guaifenesin can help it drain more easily, especially when combined with plenty of fluids. Extended-release tablets allow twice-daily dosing, which is more convenient than the standard formulation’s every-four-hour schedule.

One thing guaifenesin will not do is cure the infection. It is purely a symptom-management tool. Some combination products pair guaifenesin with a decongestant or a cough suppressant; just check the label carefully so you are not doubling up on any ingredient you are already taking separately.

What About Antihistamines?

If your sinus congestion is driven by allergies, antihistamines can help. Cetirizine, loratadine, and fexofenadine are the standard second-generation options that do not cause much drowsiness. For a pure viral or bacterial sinus infection in someone without underlying allergies, antihistamines are less useful and can sometimes make things worse by drying out mucus and making it harder to drain. The general rule: if you know you have allergies and they are contributing to your sinus problems, take an antihistamine. If you are dealing with a straightforward acute infection, skip it.

Steam Inhalation

Breathing in steam from a bowl of hot water or in a steamy shower is one of the oldest home remedies for sinus congestion. It feels soothing, but a randomized controlled trial looking at chronic and recurrent sinus symptoms found that advice to use steam inhalation was not effective. Steam reduced headache but had no significant effect on other sinus outcomes.¹¹ It will not hurt you (as long as you are careful with hot water), but do not rely on it as your primary treatment. Saline irrigation is the more evidence-backed approach for clearing your sinuses.

Herbal Remedies With Some Evidence

A handful of herbal preparations have been studied in clinical trials for sinus symptoms. BNO 1016 (sold under the brand name Sinupret), a combination of five plant extracts including gentian root and elderflower, reduced symptom scores and improved quality of life compared to placebo in adults with acute sinus infections. The benefit was more pronounced in people with moderate to severe symptoms.¹² A study in children aged six to eleven found that adding a Sinupret syrup to saline irrigation significantly improved nasal congestion, nasal discharge, and post-nasal drip compared to saline alone.¹³

These results are promising enough to be worth mentioning, but the evidence base is still small compared to what exists for standard decongestants and saline irrigation. If you are curious, these products are generally available without a prescription, though availability varies by country.

When Antibiotics Are Warranted

If your symptoms have lasted beyond ten days without improvement, or you experienced the double-worsening pattern described earlier, your doctor may reasonably prescribe an antibiotic. Amoxicillin is the traditional first choice for uncomplicated acute bacterial sinusitis. Amoxicillin-clavulanate is a broader-spectrum alternative that adds coverage against bacteria that produce enzymes capable of breaking down amoxicillin, though there is actually no consensus on which of these two should be the default first-line treatment.²

A typical course runs five to ten days. Finishing the full course matters: stopping early because you feel better can leave partially treated bacteria behind, increasing the risk of relapse. If you have a penicillin allergy, alternatives include doxycycline or a respiratory fluoroquinolone, though doctors generally reserve those for situations where first-line options truly are not an option.

Sinus Infections During Pregnancy

Pregnancy limits your medication options considerably, but it does not leave you without help. Saline irrigation is entirely safe and should be the first line of defense. Intranasal corticosteroid sprays can be continued for maintenance, with budesonide considered the treatment of choice because it has the most safety data in pregnant women.¹⁴

Nasal decongestant sprays like oxymetazoline can be used with caution and for no more than about a week. Oral pseudoephedrine is generally avoided in the first trimester due to a small associated risk, though some providers allow it later in pregnancy at limited doses. Among antihistamines, second-generation options like cetirizine (preferred in the third trimester) and loratadine (second and third trimester) are considered relatively safe.¹⁴

If a bacterial sinus infection does develop during pregnancy, beta-lactam antibiotics like amoxicillin (with dose adjustment) are considered relatively safe, as are macrolides, though erythromycin and clarithromycin carry some risk. Expert panel recommendations for rhinosinusitis in pregnancy specifically endorse using pregnancy-safe antibiotics when they are genuinely needed for acute bacterial episodes.¹⁵

Red Flags That Mean You Should Seek Care Quickly

Most sinus infections are miserable but not dangerous. The exceptions involve spread of infection beyond the sinuses themselves. Acute bacterial sinusitis can be complicated by orbital infections (swelling and redness around the eye, especially if one eye appears to be pushed forward) and intracranial infections including epidural and subdural abscesses.¹⁶ These complications are uncommon but serious.

Seek medical attention promptly if you develop any of the following during a sinus infection:

Visual changes: double vision, reduced vision, or pain with eye movement
Significant swelling: redness or swelling around one eye or the forehead
High fever: above 102°F (39°C), especially if it spikes suddenly after days of mild illness
Severe headache: unlike your typical sinus pressure, particularly if it worsens rapidly
Stiff neck or confusion: possible signs of meningeal involvement

These symptoms suggest the infection may be extending into the orbit or the skull, and they require urgent evaluation rather than another round of over-the-counter remedies.

Why Chronic Sinusitis Is a Different Problem

If your sinus symptoms drag on beyond twelve weeks, the situation is no longer acute sinusitis. Chronic rhinosinusitis involves persistent inflammation of the sinus lining, and the treatment approach shifts significantly. Repeated courses of antibiotics often provide only temporary improvement because the underlying problem is frequently not an active bacterial infection in the traditional sense.

One major reason chronic sinusitis resists standard antibiotics is the formation of bacterial biofilms on the sinus lining. These are structured communities of bacteria encased in a protective matrix. Bacteria living inside biofilms can be up to a thousand times more resistant to antibiotics than the same bacteria floating freely.¹⁷ The protective matrix blocks antibiotics from penetrating into the deeper layers, and bacteria within the biofilm slow their metabolism to a near-dormant state that makes them less vulnerable to drugs designed to kill actively growing cells.¹⁸

This is why some patients improve while on antibiotics but relapse soon after finishing the course. The antibiotics kill the free-floating bacteria shed by the biofilm, which provides temporary relief, but the biofilm itself survives. In some cases, the biofilm is only cleared by physical removal during sinus surgery.¹⁹ For chronic sinusitis, daily saline irrigation and intranasal corticosteroid sprays form the backbone of ongoing management, with surgery reserved for cases that do not respond to medical therapy.

When Fungi Are the Culprit

A small but significant subset of chronic sinus problems is caused not by bacteria but by fungi. Allergic fungal sinusitis accounts for roughly six to nine percent of rhinosinusitis cases that require surgery and is particularly common in the southern and southwestern United States.²⁰ People with this condition are typically allergic to airborne molds and develop a thick, distinctive mucus in their sinuses. They usually have nasal polyps, elevated allergy markers, and symptoms of chronic rather than acute sinusitis.

Allergic fungal sinusitis does not respond to standard antibiotics because bacteria are not the primary driver. Treatment usually requires surgery to physically remove the accumulated fungal mucus and polyps, followed by aggressive medical management including oral corticosteroids, antihistamines, and allergen immunotherapy to prevent recurrence.²¹ If you have had multiple sinus surgeries or repeated infections that never fully respond to antibiotics, allergic fungal sinusitis is worth discussing with an ear, nose, and throat specialist.

Structural Issues That Keep Infections Coming Back

Some people are simply more prone to sinus infections because of the way their anatomy is built. A deviated nasal septum, where the wall between the two nasal passages is shifted to one side, is one of the most common structural contributors. The deviation can narrow the passages that drain the sinuses, and it may also alter airflow patterns in ways that impair the normal movement of mucus out of the sinus cavities.²² When mucus sits in the sinuses rather than draining, infections have an easier foothold.

Other structural factors include narrow sinus openings, enlarged turbinates (the bony shelves inside the nose that warm and humidify air), and nasal polyps. No amount of medication will correct these problems permanently. If you find yourself dealing with sinus infections several times a year, and they always seem to affect the same side or respond only temporarily to treatment, an evaluation of your nasal anatomy with a CT scan or nasal endoscopy is worth pursuing. Surgical correction of a significant deviation or polyp removal can reduce infection frequency in people whose anatomy is the bottleneck.