Doxycycline is used for malaria prophylaxis or treatment. When it is administered for treatment of P falciparum malaria, this drug must be used as part of combination therapy (eg, typically with quinine or quinidine).
If you buy goods and are not charged the Rhode Island Sales Tax by the retailer, such as with online and out-of-state purchases, you are supposed to pay the 7% sales tax (less any foreign sales tax paid) for these items yourself as the Rhode Island Use Tax.
The State and City charge sales tax on many services and on retail sales for most goods. The total sales and use tax rate in New York City is 8.875%. This includes: New York City local sales and use tax rate of 4.5%. New York State sales and use tax rate of 4%.