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 taxes. Hawaii does not have a sales tax. Instead, the state collects a 4 percent general excise tax, which is assessed on all business activities, including retail sales, commissions, rental income and services. Other activities, such as wholesale sales, are taxed at one-half of 1 percent.