Lyme disease in the US is caused by the spirochete Borrelia burgdorferi, which is transmitted to humans by Ixodes scapularis (blacklegged [deer] tick) and I. pacificus (western blacklegged tick). Most cases of Lyme disease occur in late spring and early summer in northeastern and mid-Atlantic states, the upper Midwest, and in northern California. B. mayonii, which is also transmitted by I. scapularis, has been shown to cause a similar illness in the upper Midwest.

The FDA has approved the antiviral drug remdesivir (Veklury – Gilead) for IV treatment of COVID-19 in hospitalized patients who are ≥12 years old and weigh ≥40 kg. Hospitalized children who are <12 years old or weigh <40 kg can receive remdesivir through an Emergency Use Authorization (EUA). Remdesivir is the first drug to be approved in the US for treatment of COVID-19.

View the Comparison Table: Some Oral Drugs for Allergic Rhinitis

View the Comparison Table: Some Nonopioid Analgesics for Pain

Intrauterine devices (IUDs) and the etonogestrel implant are the most effective reversible contraceptive methods available. Hormonal oral contraceptives, patches, rings, and injectables are also effective in preventing pregnancy. When used alone, barrier and behavioral methods generally have higher failure rates than other methods (see Table 1). Selection of a contraceptive method is usually based on patient-specific factors and personal preference

A once-weekly transdermal formulation of the acetylcholinesterase inhibitor donepezil (Adlarity – Corium) has been approved by the FDA for treatment of mild, moderate, and severe Alzheimer's disease (AD) dementia. Donepezil is the second acetylcholinesterase inhibitor to become available in a transdermal formulation; transdermal rivastigmine (Exelon Patch), which is applied once daily, has been available for years for the same indication. Donepezil is also available in oral formulations (Aricept, and generics) for treatment of AD dementia.

View the Treatment of COVID-19 in High-Risk Outpatients Chart

The FDA has approved ibrexafungerp (Brexafemme – Scynexis), a first-in-class triterpenoid antifungal ("fungerp"), for oral treatment of vulvovaginal candidiasis in postmenarchal females.

Most respiratory tract infections are caused by viruses. Bacterial respiratory tract infections are usually treated empirically with antibiotic therapy that targets the most probable causative pathogens. Recommended antibiotic regimens for outpatient treatment of some common respiratory tract infections are listed in Table 1 for adults and Table 2 for children.

View the Comparison Table: Some Parenteral Anticoagulants for VTE