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.
Sales and Use Tax. The State levies a general retail sales and use tax of 4.75%. The general rate applies to purchases of tangible commodities, certain digital property, room and cottage rentals, admission charges to an entertainment activity, service contracts, and laundry and dry cleaning services.