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 Rhode Island Income Tax. Rhode Island collects a state income tax at a maximum marginal tax rate of %, spread across tax brackets. Unlike the Federal Income Tax, Rhode Island's state income tax does not provide couples filing jointly with expanded income tax brackets. Rhode Island's maximum marginal income tax rate is the 1st highest in the United States, ranking directly below Rhode Island's %.