Determining the best antibiotic for a sinus infection depends on the specific bacteria causing the infection, and this should be assessed by a healthcare professional. Commonly prescribed antibiotics for sinus infections include:

1. Amoxicillin: A broad-spectrum antibiotic often used as a first-line treatment for bacterial sinus infections.
2. Augmentin (Amoxicillin/Clavulanate): This combination antibiotic includes amoxicillin and clavulanate, which enhances its effectiveness against certain bacteria.
3. Cefdinir: A cephalosporin antibiotic effective against a variety of bacterial infections, including sinusitis.
4. Doxycycline: Particularly useful if the sinus infection is caused by atypical bacteria or if there is a penicillin allergy.
5. Levaquin (Levofloxacin): A fluoroquinolone antibiotic prescribed for severe or persistent sinus infections.

It's crucial to complete the full course of antibiotics as prescribed by a healthcare professional, even if symptoms improve before completion. Antibiotic resistance is a concern, and proper use is essential for effective treatment. Always consult with a healthcare provider to determine the most suitable antibiotic based on the specific characteristics of your sinus infection.