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.
One side nose block... Irritation in nose... Not able to take oxygen from one side of nose, headache also
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