Treatment for a sinus infection aims to unblock and drain the sinuses.

If a person has had a sinus infection for more than 7–10 days, the doctor may prescribe antibiotic therapy, but only if the infection is bacterial. Viral sinus infections often go away without treatment.

Another option is to use a prescription nasal spray to reduce swelling in the nasal passages. This allows the mucus to drain out of the sinuses more easily. Your doctor may also prescribe a saline solution to flush excess mucus from your nose. 

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https://philahomeopathy.com/sinusitis-homeopathic-treatment/