First of all 375mg is pediatric dose, it's less for an adult.
Secondly to diagnose sinusitis few investigations and detailed history is required. As sinusitis doesn't only need antibiotics but other medications also. So consider online consultation.
Health Tips
Take steam with plain water atleast 3 times a day, it will help you.
Since years I have sinus problem but now my nose bone is feeling heavy and right side nose is always bloc
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