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.
Rhode Island has 3 tax rates: 3.75%, 4.75% and 5.99%. More on the Ocean State's taxes can be found in the tabbed pages below. In 2011, Rhode Island's tax system underwent the most sweeping changes since the state tax was enacted in 1971. Most notable was the reduction of the top tax rate from 9.9% to 5.99%.