1
Ensitrelvir (Xocova) for Post-Exposure Prophylaxis of COVID-19
The Medical Letter on Drugs and Therapeutics • July 20, 2026; (Issue 1759)
The FDA has approved ensitrelvir (Xocova – Shionogi), a SARS-CoV-2 main protease inhibitor, for postexposure prophylaxis
of COVID-19 in patients ≥12 years old who had contact with
an infected individual. Ensitrelvir is the first oral antiviral
drug to be approved in the US for this indication. The parenteral
monoclonal antibody combinations bamlanivimab and
etesevimab and casirivimab and imdevimab (REGEN-COV)
are no longer authorized for postexposure prophylaxis of
COVID-19 in the US.
2
OTC Differin Epiduo Gel for Acne
The Medical Letter on Drugs and Therapeutics • July 20, 2026; (Issue 1759)
Differin Epiduo gel (Galderma), a fixed-dose combination of
the synthetic retinoid adapalene 0.1% and the oxidizing agent
benzoyl peroxide 2.5%, is now available over the counter (OTC)
for topical treatment of acne in patients ≥12 years old. It will remain available by prescription for
use in patients 9-11 years old. A gel containing adapalene
0.3% and benzoyl peroxide 2.5% (Epiduo Forte, and generics)
is available by prescription for use in patients ≥12 years old.
3
COVID-19 Update: 2025-2026 Vaccine Formulations and Recommendations
The Medical Letter on Drugs and Therapeutics • October 13, 2025; (Issue 1739)
The FDA has licensed new 2025-2026 formulations
of the mRNA COVID-19 vaccines manufactured by
Pfizer/BioNTech (Comirnaty) and Moderna (Spikevax,
mNEXSPIKE) and the adjuvanted protein subunit
COVID-19 vaccine manufactured by Novavax
(Nuvaxovid). The new formulations are indicated
for use in all adults ≥65 years old and in persons
6 months (Spikevax), 5 years (Comirnaty), or 12
years (mNEXSPIKE, Nuvaxovid) through 64 years old
who are at high risk for severe COVID-19 because
of an underlying condition. An Emergency Use
Authorization allowing administration of the Pfizer
vaccine to children 6 months through 4 years old has
been withdrawn.
4
In Brief: New Warning for OTC Orlistat (Alli)
The Medical Letter on Drugs and Therapeutics • July 20, 2026; (Issue 1759)
The FDA now requires a warning about a risk of acute kidney
injury in the product label for the 60-mg capsules of the
pancreatic and gastric lipase inhibitor orlistat, which are
available over the counter as Alli for weight loss.1 The label
for the 120-mg capsules, which are available by prescription
as Xenical, already includes a warning about a risk of
oxalate nephrolithiasis and oxalate nephropathy (orlistat
increases oxalate absorption).
5
Treatment of Common Respiratory Tract Infections
The Medical Letter on Drugs and Therapeutics • April 17, 2023; (Issue 1674)
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.
6
Treatment of Allergic Rhinitis and Allergic Conjunctivitis
The Medical Letter on Drugs and Therapeutics • March 31, 2025; (Issue 1725)
Initial treatment of allergic rhinitis (AR) depends
on the severity of symptoms and whether they are
intermittent or persistent (see Table 1).
7
Bemotrizinol — A New Sunscreen
The Medical Letter on Drugs and Therapeutics • August 3, 2026; (Issue 1760)
Bemotrizinol (bis-ethylhexyloxyphenol methoxyphenol
triazine), a broad-spectrum, organic ultraviolet (UV) filter
that has been available in Europe since 2000, is the first new
active ingredient with broad availability to be added to the
FDA's OTC sunscreen monograph in more than 25 years, and
the first organic UV filter to be generally recognized as safe
and effective (GRASE). Data with other organic UV filters
are insufficient for a GRASE designation.
8
Icotrokinra (Icotyde) for Psoriasis
The Medical Letter on Drugs and Therapeutics • August 3, 2026; (Issue 1760)
The FDA has approved the oral interleukin (IL)-23 receptor
antagonist icotrokinra (Icotyde – Janssen) for treatment
of moderate to severe plaque psoriasis in patients
≥12 years old who are candidates for systemic treatment or
phototherapy. Icotrokinra is the first oral targeted interleukin
blocker to become available in the US.
9
Comparison Chart: Some Vaccines for Adults (online only)
The Medical Letter on Drugs and Therapeutics • August 17, 2026; (Issue 1761)
View the Comparison Chart: Some Vaccines for Adults
10
Sibeprenlimab (Voyxact) for Primary Immunoglobulin A Nephropathy
The Medical Letter on Drugs and Therapeutics • August 3, 2026; (Issue 1760)
Sibeprenlimab (Voyxact – Otsuka), a subcutaneously
injected cytokine A proliferation-inducing ligand (APRIL)
blocker, has been granted accelerated approval by the FDA
to reduce proteinuria in adults with primary immunoglobulin
A nephropathy (IgAN; also called Berger's disease) who are
at risk for disease progression. Sibeprenlimab is the first
APRIL blocker to be approved in the US. Atacicept (Trutakna),
a B-lymphocyte stimulator and APRIL blocker, was recently
granted accelerated FDA approval for the same indication; it
will be reviewed in a future issue.
