Juxtapid Side Effects Center

Last updated on RxList: 11/18/2021
Juxtapid Side Effects Center

Medical Editor: John P. Cunha, DO, FACOEP

What Is Juxtapid?

Juxtapid (lomitapide) is a microsomal triglyceride transfer protein inhibitor used as an adjunct to a low-fat diet and other lipid-lowering treatments to help manage cholesterol.

What Are Side Effects of Juxtapid?

The most common side effects of Juxtapid are:

  • diarrhea,
  • constipation,
  • nausea,
  • vomiting,
  • gas,
  • indigestion,
  • stomach pain,
  • chest pain, or
  • weight loss

Tell your doctor if you have signs of a liver problem after taking Juxtapid such as:

Dosage for Juxtapid

Juxtapid is taken orally . Juxtapid should be taken once daily, whole, with water and without food, at least 2 hours after evening meal. While on Juxtapid therapy, patients must avoid grapefruit juice.

What Drugs, Substances, or Supplements Interact with Juxtapid?

CYP3A4 inhibitors such as Serzone, Sporanox, Nizoral, Vfend, Reyataz, Biaxan and Ketek are contraindicated with Juxtapid. Juxtapid also reacts with warfarin (Coumadin), simvastatin (Zocor), and lovastatin (Altocor, Altoprev, Mevacor).

Juxtapid During Pregnancy and Breastfeeding

Before treatment, women of reproductive potential must test negative for pregnancy. Juxtapid should not be used in pregnant women or nursing mothers.

Additional Information

Our Juxtapid (lomitapide) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.


What is cholesterol? See Answer
Juxtapid Consumer Information

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have signs of liver problems, such as:

  • nausea, vomiting, upper stomach pain;
  • loss of appetite;
  • swelling around your midsection;
  • flu-like symptoms, tiredness;
  • dark urine, clay-colored stools; or
  • jaundice (yellowing of the skin or eyes).

Common side effects may include:

  • stomach cramps;
  • nausea, vomiting;
  • indigestion; or
  • diarrhea.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Read the entire detailed patient monograph for Juxtapid (Lomitapide Capsules)


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Juxtapid Professional Information


The following important adverse reactions have been observed and are discussed in detail in other sections of the label:

  • Risk of hepatotoxicity [see WARNINGS AND PRECAUTIONS]
  • Reduced absorption of fat-soluble vitamins, and serum fatty acids [see WARNINGS AND PRECAUTIONS]
  • Gastrointestinal adverse reactions [see WARNINGS AND PRECAUTIONS]

Clinical Trials Experience

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.

One single-arm, open-label, 78-week trial has been conducted in 29 patients with HoFH, 23 of whom completed at least one year of treatment. The initial dosage of JUXTAPID was 5 mg daily, with titration up to 60 mg daily during an 18-week period based on safety and tolerability. In this trial, the mean age was 30.7 years (range, 18 to 55 years), 16 (55%) patients were men, 25 (86%) patients were Caucasian, 2 (7%) were Asian, 1 (3%) was African American, and 1 (3%) was multi-racial [see Clinical Studies].

Five (17%) of the 29 patients with HoFH that participated in the clinical trial discontinued treatment due to an adverse reaction. The adverse reactions that contributed to treatment discontinuations included diarrhea (2 patients; 7%) and abdominal pain, nausea, gastroenteritis, weight loss, headache, and difficulty controlling INR on warfarin (1 patient each; 3%).

The most common adverse reactions were gastrointestinal, reported by 27 (93%) of 29 patients. Adverse reactions reported by ≥8 (28%) patients in the HoFH clinical trial included diarrhea, nausea, vomiting, dyspepsia, and abdominal pain. Other common adverse reactions, reported by 5 to 7 (17- 24%) patients, included weight loss, abdominal discomfort, abdominal distension, constipation, flatulence, increased ALT, chest pain, influenza, nasopharyngitis, and fatigue.

The adverse reactions reported in at least 10% of patients during the HoFH clinical trial are presented in Table 4.

Table 4: Adverse Reactions Reported in ≥10% of Patients in the Clinical Trial in HoFH

Gastrointestinal Disorders
Diarrhea 23 (79)
Nausea 19(65)
Dyspepsia 11 (38)
Vomiting 10 (34)
Abdominal pain 10 (34)
Abdominal discomfort 6(21)
Abdominal distension 6(21)
Constipation 6(21)
Flatulence 6(21)
Gastroesophageal reflux disease 3(10)
Defecation urgency 3(10)
Rectal tenesmus 3(10)
Influenza 6(21)
Nasopharyngitis 5(17)
Gastroenteritis 4(14)
Decreased weight 7(24)
Increased ALT 5(17)
General Disorders
Chest pain 7(24)
Fatigue 5(17)
Fever 3(10)
Musculoskeletal Disorders
Back pain 4(14)
Nervous System Disorders
Headache 3(10)
Dizziness 3(10)
Respiratory Disorders
Pharyngolaryngeal pain 4(14)
Nasal congestion 3(10)
Cardiac Disorders
Angina pectoris 3(10)
Palpitations 3(10)

Adverse reactions of severe intensity were reported by 8 (28%) of 29 patients, with the most common being diarrhea (4 patients, 14%), vomiting (3 patients, 10%), increased ALT or hepatotoxicity (3 patients, 10%), and abdominal pain, distension, and/or discomfort (2 patients, 7%).

Transaminase Elevations

During the HoFH clinical trial, 10 (34%) of 29 patients had at least one elevation in ALT and/or AST ≥3x ULN (see Table 5). No clinically meaningful elevations in total bilirubin or alkaline phosphatase were observed. Transaminases typically fell within one to four weeks of reducing the dose or withholding JUXTAPID.

Table 5: Patient Incidence of Transaminase Elevations During the HoFH Clinical Trial

N (%)
Total Patients 29
Maximum ALT
≥3 to <5 ULN 6(21%)
≥5 to <10 ULN 3 (10%)
≥10 to <20 ULN 1 (3%)
≥20 ULN 0
Maximum AST
≥3 to <5 ULN 5 (17%)
≥5 to <10 ULN 1 (3%)
≥10 to <20 ULN 0
≥20 ULN 0
Upper limits of normal (ULN) ranged from 33-41 international units/L for ALT and 36-43 international units/L for AST.

Among the 19 patients who enrolled in an extension study following the HoFH clinical trial, one discontinued because of increased transaminases that persisted despite several dose reductions, and one temporarily discontinued because of markedly elevated transaminases (ALT 24x ULN, AST 13x ULN) that had several possible causes, including a drug-drug interaction between JUXTAPID and the strong CYP3A4 inhibitor clarithromycin [see DRUG INTERACTIONS].

Hepatic Steatosis

Hepatic fat was prospectively measured using magnetic resonance spectroscopy (MRS) in all eligible patients during the HoFH clinical trial. After 26 weeks, the median absolute increase in hepatic fat from baseline was 6%, and the mean absolute increase was 8% (range, 0% to 30%). After 78 weeks, the median absolute increase in hepatic fat from baseline was 6%, and the mean absolute increase was 7% (range, 0% to 18%). Among the 23 patients with evaluable data, on at least one occasion during the trial, 18 (78%) exhibited an increase in hepatic fat >5% and 3 (13%) exhibited an increase >20%. Data from individuals who had repeat measurements after stopping JUXTAPID show that hepatic fat accumulation is reversible, but whether histological sequelae remain is unknown.

Postmarketing Experience

The following adverse reactions have been identified during post-approval use of JUXTAPID. Because these reactions are reported voluntarily from a population of uncertain size, it is not possible to reliably estimate their frequency or establish a causal relationship to JUXTAPID exposure.

Musculoskeletal disorders: Myalgia

Skin reactions: Alopecia


Moderate And Strong CYP3A4 Inhibitors

A strong CYP3A4 inhibitor has been shown to increase lomitapide exposure approximately 27-fold [see CLINICAL PHARMACOLOGY]. Concomitant use of strong CYP3A4 inhibitors (such as boceprevir, clarithromycin, conivaptan, indinavir, itraconazole, ketoconazole, lopinavir/ritonavir, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telaprevir, telithromycin, tipranavir/ritonavir, voriconazole) with lomitapide is contraindicated. Concomitant use of moderate CYP3A4 inhibitors (such as amprenavir, aprepitant, atazanavir, ciprofloxacin, crizotinib, darunavir/ritonavir, diltiazem, erythromycin, fluconazole, fosamprenavir, imatinib, verapamil) has not been studied, but concomitant use with lomitapide is contraindicated since lomitapide exposure will likely increase significantly in the presence of these inhibitors.

Patients must avoid grapefruit juice while taking JUXTAPID [see CONTRAINDICATIONS, WARNINGS AND PRECAUTIONS, and CLINICAL PHARMACOLOGY].

Weak CYP3A4 Inhibitors

Weak CYP3A4 inhibitors (such as alprazolam, amiodarone, amlodipine, atorvastatin, bicalutamide, cilostazol, cimetidine, cyclosporine, fluoxetine, fluvoxamine, ginkgo, goldenseal, isoniazid, lapatinib, nilotinib, pazopanib, ranitidine, ranolazine, ticagrelor, zileuton) can increase lomitapide exposure approximately 2-fold [see CLINICAL PHARMACOLOGY]. When administered with weak CYP3A4 inhibitors, the dose of JUXTAPID should be decreased by half. Careful titration of JUXTAPID may then be considered based on LDL-C response and safety/tolerability to a maximum recommended dosage of 30 mg daily except when coadministered with oral contraceptives, in which case the maximum recommended lomitapide dosage is 40 mg daily [see DOSAGE AND ADMINISTRATION, WARNINGS AND PRECAUTIONS, and CLINICAL PHARMACOLOGY].


Lomitapide increases plasma concentrations of both R(+)-warfarin and S(-)-warfarin by approximately 30% and increased the INR 22%. Patients taking warfarin should undergo regular monitoring of INR, particularly after any changes in lomitapide dosage. The dose of warfarin should be adjusted as clinically indicated [see WARNINGS AND PRECAUTIONS].

Simvastatin And Lovastatin

The risk of myopathy, including rhabdomyolysis, with simvastatin and lovastatin monotherapy is dose related. Lomitapide approximately doubles the exposure of simvastatin; therefore, the recommended dose of simvastatin should be reduced by 50% when initiating JUXTAPID [see CLINICAL PHARMACOLOGY]. While taking JUXTAPID, limit simvastatin dosage to 20 mg daily (or 40 mg daily for patients who have previously tolerated simvastatin 80 mg daily for at least one year without evidence of muscle toxicity). Refer to the simvastatin prescribing information for simvastatin dosing recommendations.

Interaction between lovastatin and lomitapide has not been studied. However, the metabolizing enzymes and transporters responsible for the disposition of lovastatin and simvastatin are similar, suggesting that JUXTAPID may increase the exposure of lovastatin; therefore, reducing the dose of lovastatin should be considered when initiating JUXTAPID.

P-glycoprotein Substrates

Lomitapide is an inhibitor of P-glycoprotein (P-gp). Coadministration of lomitapide with P-gp substrates (such as aliskiren, ambrisentan, colchicine, dabigatran etexilate, digoxin, everolimus, fexofenadine, imatinib, lapatinib, maraviroc, nilotinib, posaconazole, ranolazine, saxagliptin, sirolimus, sitagliptin, talinolol, tolvaptan, topotecan) may increase the absorption of P-gp substrates. Dose reduction of the P-gp substrate should be considered when used concomitantly with lomitapide.

Bile Acid Sequestrants

JUXTAPID has not been tested for interaction with bile acid sequestrants. Administration of JUXTAPID and bile acid sequestrants should be separated by at least 4 hours since bile acid sequestrants can interfere with the absorption of oral medications.

Read the entire FDA prescribing information for Juxtapid (Lomitapide Capsules)

© Juxtapid Patient Information is supplied by Cerner Multum, Inc. and Juxtapid Consumer information is supplied by First Databank, Inc., used under license and subject to their respective copyrights.

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