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.
What is use tax? The use tax is a tax due on purchases, leases, and rentals of tangible personal property and certain digital property purchased, leased or rented inside or outside this State for storage, use, or consumption in North Carolina. The use tax is also due on taxable services sourced to North Carolina. The use tax is paid to the North Carolina Department of Revenue by the purchaser when the North Carolina tax has not been collected by the retailer.