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Drug Interactions between ACAM2000 and palbociclib

This report displays the potential drug interactions for the following 2 drugs:

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Interactions between your drugs

Moderate

palbociclib smallpox and monkeypox vaccine

Applies to: palbociclib and ACAM2000 (smallpox and mpox vaccine)

MONITOR: Administration of the smallpox and monkeypox vaccine, which contains a live, attenuated, non-replicating strain of orthopoxvirus, to immunosuppressed patients is generally safe but may be associated with a diminished or suboptimal immunologic response due to antibody inhibition. Such patients may include those who have recently received or are receiving immunosuppressive agents, antilymphocyte globulins, alkylating agents, antimetabolites, radiation, some antirheumatic agents, high dosages of corticosteroids or adrenocorticotropic agents (e.g., greater than or equal to 2 mg/kg/day or 20 mg/day of prednisone or equivalent for 14 consecutive days or more), or long-term topical or inhaled corticosteroids.

MANAGEMENT: It is generally advisable to complete recommended vaccinations, including smallpox and monkeypox vaccine, before starting immunosuppressant or antineoplastic treatment. Clinicians should consult public health authorities and thoroughly assess risks versus benefits prior to administering the smallpox and monkeypox vaccine to immunosuppressed individuals. If the decision is made to vaccinate, titer testing by the Centers for Disease Control and Prevention (CDC) might be considered on a case-by-case basis. Because a correlate of protection has not been established and there is no known antibody titer level that will ensure protection, titer results should be interpreted with caution to avoid providing a false sense of security. Additionally, since immunosuppressed patients might be less likely to mount an effective vaccine response, infections may occur even after full vaccination and outcomes could be particularly severe in these patients, especially following exposure to more virulent orthopoxviruses. Therefore, vaccine recipients might consider avoiding high-risk exposures until after completion of immunosuppressive therapies. Regardless of vaccination status, all individuals who work with orthopoxviruses should wear appropriate personal protective equipment.

References (4)
  1. CDC Centers for Disease Control and Prevention (2019) General Best Practice Guidelines for Immunization: Altered Immunocompetence. https://www.cdc.gov/vaccines/hcp/acip-recs/general-recs/immunocompetence.pdf
  2. (2021) "Product Information. Jynneos (smallpox and monkeypox vaccine)." Bavarian Nordic, Inc.
  3. Rao AK, Petersen BW, Whitehill F, et al. (2022) "Use of JYNNEOS (Smallpox and Monkeypox Vaccine, Live, Nonreplicating) for Preexposure Vaccination of Persons at Risk for Occupational Exposure to Orthopoxviruses: Recommendations of the Advisory Committee on Immunization Practices--United States, 2022 ht"
  4. Anonymous. (2022) Updated ATAGI Clinical Guidance on Vaccination Against MPX (Monkeypox) https://www.health.gov.au/sites/default/files/documents/2022/08/atagi-clinical-guidance-on-vaccination-against-monkeypox.pdf

Drug and food interactions

Moderate

palbociclib food

Applies to: palbociclib

GENERALLY AVOID: Grapefruit and/or grapefruit juice may increase the systemic exposure to palbociclib. The proposed mechanism is inhibition of CYP450 3A4-mediated first-pass metabolism in the gut wall by certain compounds present in grapefruit. Increased exposure to palbociclib may increase the risk of adverse effects such as infections, neutropenia, leukopenia, anemia, thrombocytopenia, anorexia, nausea, vomiting, diarrhea, stomatitis, alopecia, asthenia, peripheral neuropathy, and epistaxis.

ADJUST DOSING INTERVAL: Food may enhance the oral bioavailability of palbociclib capsules and reduce the intersubject variability of palbociclib exposure. According to the product labeling, absorption and exposure of palbociclib from its oral capsule formulation were very low in approximately 13% of the population when taken in the fasted state. Food intake increased the palbociclib exposure in this small subset of the population but did not alter exposure in the rest of the population to a clinically relevant extent. Compared to palbociclib capsules given under overnight fasted conditions, the population average palbociclib peak plasma concentration (Cmax) and systemic exposure (AUC) increased by 38% and 21%, respectively, when given with high-fat, high-calorie food (approximately 800 to 1000 calories; 150, 250, and 500 to 600 calories from protein, carbohydrate and fat, respectively); by 27% and 12%, respectively, when given with low-fat, low-calorie food (approximately 400 to 500 calories; 120, 250, and 28 to 35 calories from protein, carbohydrate and fat, respectively); and by 24% and 13%, respectively, when given with moderate-fat, standard calorie food (approximately 500 to 700 calories; 75 to 105, 250 to 350 and 175 to 245 calories from protein, carbohydrate and fat, respectively) one hour before and two hours after palbociclib capsule dosing.

MANAGEMENT: Patients should avoid consumption of grapefruit or grapefruit juice while on treatment with palbociclib. To avoid variability in drug absorption between doses, palbociclib capsules should be taken with food. Palbociclib tablet formulations may be taken with or without food.

References (4)
  1. (2020) "Product Information. Ibrance (palbociclib)." Pfizer Australia Pty Ltd, pfpibrac10620
  2. (2021) "Product Information. Ibrance (palbociclib)." Pfizer Canada Inc
  3. (2023) "Product Information. Ibrance (palbociclib)." Pfizer Ltd
  4. (2022) "Product Information. Ibrance (palbociclib)." Pfizer U.S. Pharmaceuticals Group

Therapeutic duplication warnings

No warnings were found for your selected drugs.

Therapeutic duplication warnings are only returned when drugs within the same group exceed the recommended therapeutic duplication maximum.

See also

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Drug Interaction Classification

These classifications are only a guideline. The relevance of a particular drug interaction to a specific individual is difficult to determine. Always consult your healthcare provider before starting or stopping any medication.
Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.
Unknown No interaction information available.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

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