1. Amoxicillin can be used for chronic sinusitis, and studies show it often reduces symptoms by combating bacterial infection associated with the condition.

2. Yes, amoxicillin is effective in treating chronic sinusitis. Evidence from clinical trials shows it clears infection and improves symptoms significantly.

3. Amoxicillin is a common treatment for chronic sinusitis as it helps reduce bacterial infection symptoms, supported by clinical guidelines and studies.