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.
Connecticut is one of the few states that only has a statewide sales tax rate. There are no local sales tax rates, which means that collecting sales tax is easy. No matter if you live in Connecticut or out of state, charge a flat 6.35% in sales tax to your customers in Connecticut.