The FDA has approved ceftazidime/avibactam (Avycaz – Actavis) for IV treatment of complicated urinary tract and intra-abdominal infections in adults who have limited or no other treatment options. Ceftolozane/tazobactam (Zerbaxa – Cubist), another cephalosporin/beta-lactamase inhibitor combination, was approved in 2014.

The FDA has approved delafloxacin (Baxdela – Melinta), an anionic fluoroquinolone antibiotic, for oral and parenteral treatment of adults with acute bacterial skin and skin structure infections (ABSSSIs), including those caused by methicillin-resistant Staphylococcus aureus (MRSA). It is the first fluoroquinolone to be approved for treatment of MRSA.

Tigecycline (Tygacil - Wyeth), a derivative of minocycline, is a new intravenous (IV) antibiotic approved for treatment of complicated intra-abdominal and skin and skin-structure infections.

Antimicrobial prophylaxis can decrease the incidence of postoperative surgical site infection after some procedures. Since the last Medical Letter article on this subject, consensus guidelines have been published. Recommendations for prophylaxis in specific surgical procedures are listed in Table 1.

The CDC has issued a recommendation for use of a single dose of doxycycline for post-exposure prophylaxis (PEP) of bacterial sexually transmitted infections (STIs), specifically syphilis, chlamydia, and gonorrhea, in men who have sex with men (MSM) and transgender women (TGW) who had a bacterial STI within the previous 12 months.

Harvoni, a once-daily fixed-dose combination of the direct-acting antiviral agents ledipasvir and sofosbuvir approved by the FDA in 2014 for treatment of hepatitis C virus (HCV) genotype 1 infection,1 has now been approved for use in patients infected with HCV genotype 4, 5, or 6, and in patients co-infected with HCV and HIV-1. A 12-week course of treatment with Harvoni plus ribavirin has also been approved as an alternative to 24 weeks of Harvoni alone for treatment-experienced, cirrhotic patients with HCV genotype 1 infection.HCV genotypes 4, 5, and 6 are responsible for <2% of HCV cases...

The FDA has approved ceftaroline fosamil (Teflaro – Forest), an intravenous (IV) cephalosporin, for treatment of acute bacterial skin and skin structure infections, including those caused by methicillin-resistant Staphylococcus aureus (MRSA), and for treatment of community-acquired bacterial pneumonia in adults. It is the first beta-lactam antibiotic approved for treatment of MRSA.

The FDA has approved Zepatier (Merck), a fixed-dose combination of two direct-acting antiviral agents — elbasvir, an NS5A inhibitor, and grazoprevir, an NS3/4A protease inhibitor — for oral treatment of chronic hepatitis C virus (HCV) genotype 1 or 4 infection.

The FDA has approved Apretude (ViiV Healthcare), an IM extended-release (ER) formulation of the integrase strand transfer inhibitor (INSTI) cabotegravir, for use every 2 months to prevent sexually acquired HIV-1 infection in at-risk adolescents and adults. Apretude is the first ER formulation to be FDA-approved for pre-exposure prophylaxis (PrEP) of HIV-1 infection.

Ertapenem (er ta pen' em; Invanz - Merck), a carbapenem antibacterial with a narrower spectrum of activity than imipenem (Primaxin) or meropenem (Merrem), has been approved by the FDA for once-daily IV treatment of complicated intra-abdominal, urinary tract and skin and skin structure infections, acute pelvic infections, and community-acquired pneumonia.