Both alirocumab and evolocumab have been evaluated in patients with
176–178 All patients in these studies were on maximally tolerated doses of
statins. In the combined studies evaluating alirocumab, patients had an average
baseline LDL-C of 141 mg/dL. Patients were treated for 12 weeks with alirocumab
75 mg every 2 weeks or placebo. At the end of the treatment period, the mean LDL-C
reduction observed with alirocumab was 48%. As with other studies with
alirocumab, if additional LDL-C lowering was needed patients were given an
additional 12 weeks of therapy with an increased dose of 150 mg every 2 weeks.
Following an additional 12 weeks of treatment, the mean LDL-C reduction from
baseline was 54% (p < 0.0001). Almost half (42%) of the study population received
the higher dose. Evolocumab was evaluated in the patient population in the
178 Patients were randomized to receive 140 mg every 2
therapy, evolocumab reduced baseline LDL-C by 61% with twice-weekly dosing and
62% with monthly dosing (p < 0.0001).
Evolocumab has been studied in patients with HoFH in the Trial Evaluating
PCSK9 Antibody in Subjects with LDLReceptor Abnormalities (TESLA- Part B).
This was a multicenter, double-blind, randomized, placebo-controlled, 12-week trial
in 49 patients. Patients received 420 mg monthly of evolocumab or placebo. The
mean LDL-C at baseline was 349 mg/dL. All patients were on either atorvastatin or
rosuvastatin with 92% also being on ezetimibe. Following 12 weeks of treatment
with evolocumab, the mean decrease in LDL-C from baseline was 31% (p < 0.0001).
PHARMACOKINETICS/PHARMACODYNAMICS
Alirocumab and evolocumab are both human monoclonal IGg2 antibodies and
therefore must be administered via subcutaneous injection to exert an effect.
Maximum suppression of PCSK9 occurs in approximately 4 hours with evolocumab
and 4 to 8 hours with alirocumab. Maximum serum concentrations reached in 3 to 4
days with evolocumab and 3 to 7 days with alirocumab. The volume of distribution
for both agents is small; therefore, these agents are expected to stay in the
extracellular space. Alirocumab is eliminated through degradation to small peptides
and amino acids while evolocumab is cleared based on its concentration. At low
concentrations it is cleared primarily thru saturable binding to PCSK9 and at higher
concentrations it is eliminated via a
non-saturable proteolytic pathway. The half-life of alirocumab is 17 to 20 days and
The most common adverse effects reported in the 52 weeks study with evolocumab
were nasopharyngitis, upper respiratory tract infection, influenza, back pain, and
injection site reactions. However, the difference in the incidence compared to
placebo is relatively small. The most common injection site reactions were erythema,
pain, and bruising. The most common adverse effect leading to discontinuation was
myalgia that occurred in 0.3% of evolocumab patients and 0% in those receiving
placebo. In pooled studies the types of adverse effects reported were relatively
similar. Allergic reactions occurred in 5.1% of evolocumab-treated patients and
4.6% in those treated with placebo. Neurocognitive events were reported in less than
0.2% of patients. Hypersensitivity reactions such as rash and urticaria were also
reported in 1% and 0.4%, respectively, with cases resulting in discontinuation of
therapy. The adverse reactions reported with alirocumab were nasopharyngitis,
injection site reactions, influenza, and urinary tract infection. The main adverse
effects associated with discontinuation were allergic reactions (0.6% vs. 0.2% for
placebo) and elevated liver enzymes (0.3% vs. <0.1% for placebo). Injection site
reactions were similar to those reported with evolocumab. Neurocognitive events
were reported in 0.8% of patients treated with alirocumab compared to 0.7% for
placebo. Hypersensitivity reactions also occurred with alirocumab. However,
hypersensitivity vasculitis as well as hypersensitivity reactions requiring
hospitalizations were reported with alirocumab but not with evolocumab.
Neutralizing antibodies were detected in 1.2% of patients treated with alirocumab,
and no cases were reported in patients taking evolocumab. However, the long-term
consequences from developing neutralizing antibodies are currently unknown.
Both alirocumab and evolocumab are indicated as an adjunct to diet and maximally
tolerated statin therapy in patients with HeFH or clinical ASCVD, who require
additional reductions in LDL-C. These agents should be considered as either add-on
therapy to patients already on statin therapy who need additional LDL-C lowering, or
in patients who are deemed statin intolerant.
100 Evolocumab is also indicated for use
in combination with other lipid-lowering therapies including LDL apheresis in
patients with HoFH who require additional lowering in LDL-C. Alirocumab is
administered as a dose of 75 mg every 2 weeks and may be increased in 4 to 8 weeks
to 150 mg every 2 weeks if additional LDL-C lowering is required. Evolocumab is
dosed at 140 mg every 2 weeks or 420 mg once monthly for HeFH and those with
primary hypercholesterolemia with clinical ASCVD. In patients with HoFH, the dose
is 420 mg once monthly. Alirocumab has only been studied in patients over the age of
18, while evolocumab may be used in the adolescent population with HoFH aged 13
to 17. Neither agent requires a dose adjustment in patients with mild to moderate
renal insufficiency. No data are available for patients with CrCl < 30 mL/minute.
Since these proteins do not rely upon the kidneys as a method of excretion, they can
likely be used in patients with low CrCl, including those undergoing hemodialysis.
However, the PCSK9 inhibitors have not been studied in this patient population.
Additionally, since they are large molecules, it is unlikely they would be removed by
hemodialysis. No dose adjustment is necessary in patients with hepatic impairment.
Allow evolocumab injections to warm at room temperature for at least 30 minutes
prior to use and alirocumab 30 to 40 minutes prior to use.
Do not warm evolocumab by any other means than setting at room temperature (e.g.,
If you miss a dose of evolocumab and the time to next dose is greater than 7 days,
administer the dose. If less than 7 days, hold the dose and get back on usual
Evolocumab and alirocumab may be injected into the thigh, abdomen, or upper arm.
Evolocumab can remain at room temperature but expires in 30 days.
Alirocumab should not be left unrefrigerated for greater than 24 hours.
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Lipid Management in Chronic Kidney Disease. Kidney Int. 2013;3:259–305. (62)
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