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Drug Interactions between Adderall XR and measles virus vaccine / mumps virus vaccine / rubella virus vaccine / varicella virus vaccine

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

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Interactions between your drugs

Moderate

measles virus vaccine rubella virus vaccine

Applies to: measles virus vaccine / mumps virus vaccine / rubella virus vaccine / varicella virus vaccine and measles virus vaccine / mumps virus vaccine / rubella virus vaccine / varicella virus vaccine

ADJUST DOSING INTERVAL: If multiple live, attenuated parenteral viral or bacterial vaccines are not given on the same day, but are administered within 28 days of each other, the immune response to the second live parenteral vaccine may be diminished by the immune response to the first. The exact mechanism of this interaction is unknown, but may involve competition for cellular receptors, competition for molecular substrates required for replication, and/or induction of inhibitory host proteins like interferon. Clinical data are limited and sometimes conflicting. One randomized clinical trial in Brazil was conducted in 12-month-old children (n=1769) receiving routine vaccinations. Volunteers were randomized to receive simultaneous yellow fever (YF) and measles, mumps, rubella (MMR) vaccines or to receive YF 30 days after the MMR vaccine. Subjects who received both vaccines simultaneously had lower seroconversion rates for rubella, YF, and mumps than those vaccinated 30 days apart (90% vs. 97%, 70% vs. 87%, and 62% vs. 71%, respectively). Seroconversion rates for measles were unaffected (>98% in both groups). Geometric mean titers (GMT) for rubella and YF were approximately three times higher in those who were vaccinated 30 days apart. However, a different randomized, non-inferiority trial in healthy one-year-old children in Argentina (n=738), which evaluated coadministration of MMR and YF vaccines compared to MMR followed by the YF vaccine 28 to 35 days later, or YF followed by the MMR vaccine 28 to 35 days later, reported that effective seroconversion was achieved when the two vaccines were administered concurrently. This study did note that antibody levels for rubella and YF were significantly lower following co-administration. A separate study conducted in two U.S. health maintenance organizations found that the risk for varicella vaccine failure (defined as varicella disease in a vaccinated individual) was three times higher in those who received the varicella vaccine within 28 days of the MMR vaccine, when compared to those who received the varicella vaccine more than 28 days after MMR vaccination. Clinical data are not available for all possible live vaccine combinations in all age groups.

MANAGEMENT: The U.S. Centers for Disease Control and Prevention's Advisory Committee on Immunization Practices generally recommends that doses of live, attenuated parenteral viral or bacterial vaccines that are not administered simultaneously (using different injection sites and separate needles and syringes for injectable products not formulated as combinations) should be separated by an interval of at least 28 days. If the live vaccines involved are separated by less than 4 weeks, the second vaccine administered should not be counted and the dose should be repeated at least 4 weeks later. Oral vaccines (e.g., Ty21a typhoid vaccine and rotavirus) can be administered simultaneously with or at any interval before or after other live vaccines if indicated. The United Kingdom's Green Book recommends always separating the YF and MMR vaccines by at least 4 weeks, unless rapid protection is required in which case they advise considering an additional dose of the MMR vaccine. Additionally, the Canadian Immunization Guide recommends avoiding simultaneous administration of a first-generation smallpox vaccine with a varicella-containing vaccine; suggesting that if both are needed, the varicella-containing vaccine should be given at least 4 weeks before or after the first-generation smallpox vaccine. Current local immunization guidelines and prescribing information for individual vaccines should be consulted for specific recommendations.

References (9)
  1. Public Health Agency of Canada (2025) Timing of vaccine administration: Canadian Immunization Guide. https://www.canada.ca/en/public-health/services/publications/healthy-living/canadian-immunization-guide-part-1-key-immunization-information/page-10-timing-vaccine-administration.html
  2. US Centers for Disease Control and Prevention (CDC) (2025) Timing and spacing of immunobiologics. https://www.cdc.gov/vaccines/hcp/imz-best-practices/timing-spacing-immunobiologics.html
  3. Staples JE, O'Laughlin K (2025) Yellow Fever https://www.cdc.gov/yellow-book/hcp/travel-associated-infections-diseases/yellow-fever.html#prevent
  4. UK Health Security Agency (2025) Contraindications and special considerations: the green book, chapter 6. https://www.gov.uk/government/publications/contraindications-and-special-considerations-the-green-book-chapter-6
  5. UK Health Security Agency (2025) Measles: the green book, chapter 21. https://www.gov.uk/government/publications/measles-the-green-book-chapter-21
  6. Australian Government. Department of Health and Aged Care (2025) Preparing for vaccination. https://immunisationhandbook.health.gov.au/contents/vaccination-procedures/preparing-for-vaccination
  7. Nascimento Silva JR, Camacho LA, Siqueira MM, et al. (2011) "Mutual interference on the immune response to yellow fever vaccine and a combined vaccine against measles, mumps and rubella." Vaccine, 29, p. 6327-34
  8. Boikos C, Papenburg J, Martineau C, et al. (2017) "Viral interference and the live-attenuated intranasal influenza vaccine: results from a pediatric cohort with cystic fibrosis." Hum Vacc Immunother, 13, p. 1254-60
  9. Vizzotti C, Harris JB, Aquino A, et al. (2025) Immune response to co-administration of measles, mumps, and rubella (MMR) and yellow fever vaccines: a randomized non-inferiority trial among one-year-old children in Argentina. https://pmc.ncbi.nlm.nih.gov/articles/PMC10021967/
Moderate

measles virus vaccine mumps virus vaccine

Applies to: measles virus vaccine / mumps virus vaccine / rubella virus vaccine / varicella virus vaccine and measles virus vaccine / mumps virus vaccine / rubella virus vaccine / varicella virus vaccine

ADJUST DOSING INTERVAL: If multiple live, attenuated parenteral viral or bacterial vaccines are not given on the same day, but are administered within 28 days of each other, the immune response to the second live parenteral vaccine may be diminished by the immune response to the first. The exact mechanism of this interaction is unknown, but may involve competition for cellular receptors, competition for molecular substrates required for replication, and/or induction of inhibitory host proteins like interferon. Clinical data are limited and sometimes conflicting. One randomized clinical trial in Brazil was conducted in 12-month-old children (n=1769) receiving routine vaccinations. Volunteers were randomized to receive simultaneous yellow fever (YF) and measles, mumps, rubella (MMR) vaccines or to receive YF 30 days after the MMR vaccine. Subjects who received both vaccines simultaneously had lower seroconversion rates for rubella, YF, and mumps than those vaccinated 30 days apart (90% vs. 97%, 70% vs. 87%, and 62% vs. 71%, respectively). Seroconversion rates for measles were unaffected (>98% in both groups). Geometric mean titers (GMT) for rubella and YF were approximately three times higher in those who were vaccinated 30 days apart. However, a different randomized, non-inferiority trial in healthy one-year-old children in Argentina (n=738), which evaluated coadministration of MMR and YF vaccines compared to MMR followed by the YF vaccine 28 to 35 days later, or YF followed by the MMR vaccine 28 to 35 days later, reported that effective seroconversion was achieved when the two vaccines were administered concurrently. This study did note that antibody levels for rubella and YF were significantly lower following co-administration. A separate study conducted in two U.S. health maintenance organizations found that the risk for varicella vaccine failure (defined as varicella disease in a vaccinated individual) was three times higher in those who received the varicella vaccine within 28 days of the MMR vaccine, when compared to those who received the varicella vaccine more than 28 days after MMR vaccination. Clinical data are not available for all possible live vaccine combinations in all age groups.

MANAGEMENT: The U.S. Centers for Disease Control and Prevention's Advisory Committee on Immunization Practices generally recommends that doses of live, attenuated parenteral viral or bacterial vaccines that are not administered simultaneously (using different injection sites and separate needles and syringes for injectable products not formulated as combinations) should be separated by an interval of at least 28 days. If the live vaccines involved are separated by less than 4 weeks, the second vaccine administered should not be counted and the dose should be repeated at least 4 weeks later. Oral vaccines (e.g., Ty21a typhoid vaccine and rotavirus) can be administered simultaneously with or at any interval before or after other live vaccines if indicated. The United Kingdom's Green Book recommends always separating the YF and MMR vaccines by at least 4 weeks, unless rapid protection is required in which case they advise considering an additional dose of the MMR vaccine. Additionally, the Canadian Immunization Guide recommends avoiding simultaneous administration of a first-generation smallpox vaccine with a varicella-containing vaccine; suggesting that if both are needed, the varicella-containing vaccine should be given at least 4 weeks before or after the first-generation smallpox vaccine. Current local immunization guidelines and prescribing information for individual vaccines should be consulted for specific recommendations.

References (9)
  1. Public Health Agency of Canada (2025) Timing of vaccine administration: Canadian Immunization Guide. https://www.canada.ca/en/public-health/services/publications/healthy-living/canadian-immunization-guide-part-1-key-immunization-information/page-10-timing-vaccine-administration.html
  2. US Centers for Disease Control and Prevention (CDC) (2025) Timing and spacing of immunobiologics. https://www.cdc.gov/vaccines/hcp/imz-best-practices/timing-spacing-immunobiologics.html
  3. Staples JE, O'Laughlin K (2025) Yellow Fever https://www.cdc.gov/yellow-book/hcp/travel-associated-infections-diseases/yellow-fever.html#prevent
  4. UK Health Security Agency (2025) Contraindications and special considerations: the green book, chapter 6. https://www.gov.uk/government/publications/contraindications-and-special-considerations-the-green-book-chapter-6
  5. UK Health Security Agency (2025) Measles: the green book, chapter 21. https://www.gov.uk/government/publications/measles-the-green-book-chapter-21
  6. Australian Government. Department of Health and Aged Care (2025) Preparing for vaccination. https://immunisationhandbook.health.gov.au/contents/vaccination-procedures/preparing-for-vaccination
  7. Nascimento Silva JR, Camacho LA, Siqueira MM, et al. (2011) "Mutual interference on the immune response to yellow fever vaccine and a combined vaccine against measles, mumps and rubella." Vaccine, 29, p. 6327-34
  8. Boikos C, Papenburg J, Martineau C, et al. (2017) "Viral interference and the live-attenuated intranasal influenza vaccine: results from a pediatric cohort with cystic fibrosis." Hum Vacc Immunother, 13, p. 1254-60
  9. Vizzotti C, Harris JB, Aquino A, et al. (2025) Immune response to co-administration of measles, mumps, and rubella (MMR) and yellow fever vaccines: a randomized non-inferiority trial among one-year-old children in Argentina. https://pmc.ncbi.nlm.nih.gov/articles/PMC10021967/
Moderate

measles virus vaccine varicella virus vaccine

Applies to: measles virus vaccine / mumps virus vaccine / rubella virus vaccine / varicella virus vaccine and measles virus vaccine / mumps virus vaccine / rubella virus vaccine / varicella virus vaccine

ADJUST DOSING INTERVAL: If multiple live, attenuated parenteral viral or bacterial vaccines are not given on the same day, but are administered within 28 days of each other, the immune response to the second live parenteral vaccine may be diminished by the immune response to the first. The exact mechanism of this interaction is unknown, but may involve competition for cellular receptors, competition for molecular substrates required for replication, and/or induction of inhibitory host proteins like interferon. Clinical data are limited and sometimes conflicting. One randomized clinical trial in Brazil was conducted in 12-month-old children (n=1769) receiving routine vaccinations. Volunteers were randomized to receive simultaneous yellow fever (YF) and measles, mumps, rubella (MMR) vaccines or to receive YF 30 days after the MMR vaccine. Subjects who received both vaccines simultaneously had lower seroconversion rates for rubella, YF, and mumps than those vaccinated 30 days apart (90% vs. 97%, 70% vs. 87%, and 62% vs. 71%, respectively). Seroconversion rates for measles were unaffected (>98% in both groups). Geometric mean titers (GMT) for rubella and YF were approximately three times higher in those who were vaccinated 30 days apart. However, a different randomized, non-inferiority trial in healthy one-year-old children in Argentina (n=738), which evaluated coadministration of MMR and YF vaccines compared to MMR followed by the YF vaccine 28 to 35 days later, or YF followed by the MMR vaccine 28 to 35 days later, reported that effective seroconversion was achieved when the two vaccines were administered concurrently. This study did note that antibody levels for rubella and YF were significantly lower following co-administration. A separate study conducted in two U.S. health maintenance organizations found that the risk for varicella vaccine failure (defined as varicella disease in a vaccinated individual) was three times higher in those who received the varicella vaccine within 28 days of the MMR vaccine, when compared to those who received the varicella vaccine more than 28 days after MMR vaccination. Clinical data are not available for all possible live vaccine combinations in all age groups.

MANAGEMENT: The U.S. Centers for Disease Control and Prevention's Advisory Committee on Immunization Practices generally recommends that doses of live, attenuated parenteral viral or bacterial vaccines that are not administered simultaneously (using different injection sites and separate needles and syringes for injectable products not formulated as combinations) should be separated by an interval of at least 28 days. If the live vaccines involved are separated by less than 4 weeks, the second vaccine administered should not be counted and the dose should be repeated at least 4 weeks later. Oral vaccines (e.g., Ty21a typhoid vaccine and rotavirus) can be administered simultaneously with or at any interval before or after other live vaccines if indicated. The United Kingdom's Green Book recommends always separating the YF and MMR vaccines by at least 4 weeks, unless rapid protection is required in which case they advise considering an additional dose of the MMR vaccine. Additionally, the Canadian Immunization Guide recommends avoiding simultaneous administration of a first-generation smallpox vaccine with a varicella-containing vaccine; suggesting that if both are needed, the varicella-containing vaccine should be given at least 4 weeks before or after the first-generation smallpox vaccine. Current local immunization guidelines and prescribing information for individual vaccines should be consulted for specific recommendations.

References (9)
  1. Public Health Agency of Canada (2025) Timing of vaccine administration: Canadian Immunization Guide. https://www.canada.ca/en/public-health/services/publications/healthy-living/canadian-immunization-guide-part-1-key-immunization-information/page-10-timing-vaccine-administration.html
  2. US Centers for Disease Control and Prevention (CDC) (2025) Timing and spacing of immunobiologics. https://www.cdc.gov/vaccines/hcp/imz-best-practices/timing-spacing-immunobiologics.html
  3. Staples JE, O'Laughlin K (2025) Yellow Fever https://www.cdc.gov/yellow-book/hcp/travel-associated-infections-diseases/yellow-fever.html#prevent
  4. UK Health Security Agency (2025) Contraindications and special considerations: the green book, chapter 6. https://www.gov.uk/government/publications/contraindications-and-special-considerations-the-green-book-chapter-6
  5. UK Health Security Agency (2025) Measles: the green book, chapter 21. https://www.gov.uk/government/publications/measles-the-green-book-chapter-21
  6. Australian Government. Department of Health and Aged Care (2025) Preparing for vaccination. https://immunisationhandbook.health.gov.au/contents/vaccination-procedures/preparing-for-vaccination
  7. Nascimento Silva JR, Camacho LA, Siqueira MM, et al. (2011) "Mutual interference on the immune response to yellow fever vaccine and a combined vaccine against measles, mumps and rubella." Vaccine, 29, p. 6327-34
  8. Boikos C, Papenburg J, Martineau C, et al. (2017) "Viral interference and the live-attenuated intranasal influenza vaccine: results from a pediatric cohort with cystic fibrosis." Hum Vacc Immunother, 13, p. 1254-60
  9. Vizzotti C, Harris JB, Aquino A, et al. (2025) Immune response to co-administration of measles, mumps, and rubella (MMR) and yellow fever vaccines: a randomized non-inferiority trial among one-year-old children in Argentina. https://pmc.ncbi.nlm.nih.gov/articles/PMC10021967/
Moderate

rubella virus vaccine mumps virus vaccine

Applies to: measles virus vaccine / mumps virus vaccine / rubella virus vaccine / varicella virus vaccine and measles virus vaccine / mumps virus vaccine / rubella virus vaccine / varicella virus vaccine

ADJUST DOSING INTERVAL: If multiple live, attenuated parenteral viral or bacterial vaccines are not given on the same day, but are administered within 28 days of each other, the immune response to the second live parenteral vaccine may be diminished by the immune response to the first. The exact mechanism of this interaction is unknown, but may involve competition for cellular receptors, competition for molecular substrates required for replication, and/or induction of inhibitory host proteins like interferon. Clinical data are limited and sometimes conflicting. One randomized clinical trial in Brazil was conducted in 12-month-old children (n=1769) receiving routine vaccinations. Volunteers were randomized to receive simultaneous yellow fever (YF) and measles, mumps, rubella (MMR) vaccines or to receive YF 30 days after the MMR vaccine. Subjects who received both vaccines simultaneously had lower seroconversion rates for rubella, YF, and mumps than those vaccinated 30 days apart (90% vs. 97%, 70% vs. 87%, and 62% vs. 71%, respectively). Seroconversion rates for measles were unaffected (>98% in both groups). Geometric mean titers (GMT) for rubella and YF were approximately three times higher in those who were vaccinated 30 days apart. However, a different randomized, non-inferiority trial in healthy one-year-old children in Argentina (n=738), which evaluated coadministration of MMR and YF vaccines compared to MMR followed by the YF vaccine 28 to 35 days later, or YF followed by the MMR vaccine 28 to 35 days later, reported that effective seroconversion was achieved when the two vaccines were administered concurrently. This study did note that antibody levels for rubella and YF were significantly lower following co-administration. A separate study conducted in two U.S. health maintenance organizations found that the risk for varicella vaccine failure (defined as varicella disease in a vaccinated individual) was three times higher in those who received the varicella vaccine within 28 days of the MMR vaccine, when compared to those who received the varicella vaccine more than 28 days after MMR vaccination. Clinical data are not available for all possible live vaccine combinations in all age groups.

MANAGEMENT: The U.S. Centers for Disease Control and Prevention's Advisory Committee on Immunization Practices generally recommends that doses of live, attenuated parenteral viral or bacterial vaccines that are not administered simultaneously (using different injection sites and separate needles and syringes for injectable products not formulated as combinations) should be separated by an interval of at least 28 days. If the live vaccines involved are separated by less than 4 weeks, the second vaccine administered should not be counted and the dose should be repeated at least 4 weeks later. Oral vaccines (e.g., Ty21a typhoid vaccine and rotavirus) can be administered simultaneously with or at any interval before or after other live vaccines if indicated. The United Kingdom's Green Book recommends always separating the YF and MMR vaccines by at least 4 weeks, unless rapid protection is required in which case they advise considering an additional dose of the MMR vaccine. Additionally, the Canadian Immunization Guide recommends avoiding simultaneous administration of a first-generation smallpox vaccine with a varicella-containing vaccine; suggesting that if both are needed, the varicella-containing vaccine should be given at least 4 weeks before or after the first-generation smallpox vaccine. Current local immunization guidelines and prescribing information for individual vaccines should be consulted for specific recommendations.

References (9)
  1. Public Health Agency of Canada (2025) Timing of vaccine administration: Canadian Immunization Guide. https://www.canada.ca/en/public-health/services/publications/healthy-living/canadian-immunization-guide-part-1-key-immunization-information/page-10-timing-vaccine-administration.html
  2. US Centers for Disease Control and Prevention (CDC) (2025) Timing and spacing of immunobiologics. https://www.cdc.gov/vaccines/hcp/imz-best-practices/timing-spacing-immunobiologics.html
  3. Staples JE, O'Laughlin K (2025) Yellow Fever https://www.cdc.gov/yellow-book/hcp/travel-associated-infections-diseases/yellow-fever.html#prevent
  4. UK Health Security Agency (2025) Contraindications and special considerations: the green book, chapter 6. https://www.gov.uk/government/publications/contraindications-and-special-considerations-the-green-book-chapter-6
  5. UK Health Security Agency (2025) Measles: the green book, chapter 21. https://www.gov.uk/government/publications/measles-the-green-book-chapter-21
  6. Australian Government. Department of Health and Aged Care (2025) Preparing for vaccination. https://immunisationhandbook.health.gov.au/contents/vaccination-procedures/preparing-for-vaccination
  7. Nascimento Silva JR, Camacho LA, Siqueira MM, et al. (2011) "Mutual interference on the immune response to yellow fever vaccine and a combined vaccine against measles, mumps and rubella." Vaccine, 29, p. 6327-34
  8. Boikos C, Papenburg J, Martineau C, et al. (2017) "Viral interference and the live-attenuated intranasal influenza vaccine: results from a pediatric cohort with cystic fibrosis." Hum Vacc Immunother, 13, p. 1254-60
  9. Vizzotti C, Harris JB, Aquino A, et al. (2025) Immune response to co-administration of measles, mumps, and rubella (MMR) and yellow fever vaccines: a randomized non-inferiority trial among one-year-old children in Argentina. https://pmc.ncbi.nlm.nih.gov/articles/PMC10021967/
Moderate

rubella virus vaccine varicella virus vaccine

Applies to: measles virus vaccine / mumps virus vaccine / rubella virus vaccine / varicella virus vaccine and measles virus vaccine / mumps virus vaccine / rubella virus vaccine / varicella virus vaccine

ADJUST DOSING INTERVAL: If multiple live, attenuated parenteral viral or bacterial vaccines are not given on the same day, but are administered within 28 days of each other, the immune response to the second live parenteral vaccine may be diminished by the immune response to the first. The exact mechanism of this interaction is unknown, but may involve competition for cellular receptors, competition for molecular substrates required for replication, and/or induction of inhibitory host proteins like interferon. Clinical data are limited and sometimes conflicting. One randomized clinical trial in Brazil was conducted in 12-month-old children (n=1769) receiving routine vaccinations. Volunteers were randomized to receive simultaneous yellow fever (YF) and measles, mumps, rubella (MMR) vaccines or to receive YF 30 days after the MMR vaccine. Subjects who received both vaccines simultaneously had lower seroconversion rates for rubella, YF, and mumps than those vaccinated 30 days apart (90% vs. 97%, 70% vs. 87%, and 62% vs. 71%, respectively). Seroconversion rates for measles were unaffected (>98% in both groups). Geometric mean titers (GMT) for rubella and YF were approximately three times higher in those who were vaccinated 30 days apart. However, a different randomized, non-inferiority trial in healthy one-year-old children in Argentina (n=738), which evaluated coadministration of MMR and YF vaccines compared to MMR followed by the YF vaccine 28 to 35 days later, or YF followed by the MMR vaccine 28 to 35 days later, reported that effective seroconversion was achieved when the two vaccines were administered concurrently. This study did note that antibody levels for rubella and YF were significantly lower following co-administration. A separate study conducted in two U.S. health maintenance organizations found that the risk for varicella vaccine failure (defined as varicella disease in a vaccinated individual) was three times higher in those who received the varicella vaccine within 28 days of the MMR vaccine, when compared to those who received the varicella vaccine more than 28 days after MMR vaccination. Clinical data are not available for all possible live vaccine combinations in all age groups.

MANAGEMENT: The U.S. Centers for Disease Control and Prevention's Advisory Committee on Immunization Practices generally recommends that doses of live, attenuated parenteral viral or bacterial vaccines that are not administered simultaneously (using different injection sites and separate needles and syringes for injectable products not formulated as combinations) should be separated by an interval of at least 28 days. If the live vaccines involved are separated by less than 4 weeks, the second vaccine administered should not be counted and the dose should be repeated at least 4 weeks later. Oral vaccines (e.g., Ty21a typhoid vaccine and rotavirus) can be administered simultaneously with or at any interval before or after other live vaccines if indicated. The United Kingdom's Green Book recommends always separating the YF and MMR vaccines by at least 4 weeks, unless rapid protection is required in which case they advise considering an additional dose of the MMR vaccine. Additionally, the Canadian Immunization Guide recommends avoiding simultaneous administration of a first-generation smallpox vaccine with a varicella-containing vaccine; suggesting that if both are needed, the varicella-containing vaccine should be given at least 4 weeks before or after the first-generation smallpox vaccine. Current local immunization guidelines and prescribing information for individual vaccines should be consulted for specific recommendations.

References (9)
  1. Public Health Agency of Canada (2025) Timing of vaccine administration: Canadian Immunization Guide. https://www.canada.ca/en/public-health/services/publications/healthy-living/canadian-immunization-guide-part-1-key-immunization-information/page-10-timing-vaccine-administration.html
  2. US Centers for Disease Control and Prevention (CDC) (2025) Timing and spacing of immunobiologics. https://www.cdc.gov/vaccines/hcp/imz-best-practices/timing-spacing-immunobiologics.html
  3. Staples JE, O'Laughlin K (2025) Yellow Fever https://www.cdc.gov/yellow-book/hcp/travel-associated-infections-diseases/yellow-fever.html#prevent
  4. UK Health Security Agency (2025) Contraindications and special considerations: the green book, chapter 6. https://www.gov.uk/government/publications/contraindications-and-special-considerations-the-green-book-chapter-6
  5. UK Health Security Agency (2025) Measles: the green book, chapter 21. https://www.gov.uk/government/publications/measles-the-green-book-chapter-21
  6. Australian Government. Department of Health and Aged Care (2025) Preparing for vaccination. https://immunisationhandbook.health.gov.au/contents/vaccination-procedures/preparing-for-vaccination
  7. Nascimento Silva JR, Camacho LA, Siqueira MM, et al. (2011) "Mutual interference on the immune response to yellow fever vaccine and a combined vaccine against measles, mumps and rubella." Vaccine, 29, p. 6327-34
  8. Boikos C, Papenburg J, Martineau C, et al. (2017) "Viral interference and the live-attenuated intranasal influenza vaccine: results from a pediatric cohort with cystic fibrosis." Hum Vacc Immunother, 13, p. 1254-60
  9. Vizzotti C, Harris JB, Aquino A, et al. (2025) Immune response to co-administration of measles, mumps, and rubella (MMR) and yellow fever vaccines: a randomized non-inferiority trial among one-year-old children in Argentina. https://pmc.ncbi.nlm.nih.gov/articles/PMC10021967/
Moderate

mumps virus vaccine varicella virus vaccine

Applies to: measles virus vaccine / mumps virus vaccine / rubella virus vaccine / varicella virus vaccine and measles virus vaccine / mumps virus vaccine / rubella virus vaccine / varicella virus vaccine

ADJUST DOSING INTERVAL: If multiple live, attenuated parenteral viral or bacterial vaccines are not given on the same day, but are administered within 28 days of each other, the immune response to the second live parenteral vaccine may be diminished by the immune response to the first. The exact mechanism of this interaction is unknown, but may involve competition for cellular receptors, competition for molecular substrates required for replication, and/or induction of inhibitory host proteins like interferon. Clinical data are limited and sometimes conflicting. One randomized clinical trial in Brazil was conducted in 12-month-old children (n=1769) receiving routine vaccinations. Volunteers were randomized to receive simultaneous yellow fever (YF) and measles, mumps, rubella (MMR) vaccines or to receive YF 30 days after the MMR vaccine. Subjects who received both vaccines simultaneously had lower seroconversion rates for rubella, YF, and mumps than those vaccinated 30 days apart (90% vs. 97%, 70% vs. 87%, and 62% vs. 71%, respectively). Seroconversion rates for measles were unaffected (>98% in both groups). Geometric mean titers (GMT) for rubella and YF were approximately three times higher in those who were vaccinated 30 days apart. However, a different randomized, non-inferiority trial in healthy one-year-old children in Argentina (n=738), which evaluated coadministration of MMR and YF vaccines compared to MMR followed by the YF vaccine 28 to 35 days later, or YF followed by the MMR vaccine 28 to 35 days later, reported that effective seroconversion was achieved when the two vaccines were administered concurrently. This study did note that antibody levels for rubella and YF were significantly lower following co-administration. A separate study conducted in two U.S. health maintenance organizations found that the risk for varicella vaccine failure (defined as varicella disease in a vaccinated individual) was three times higher in those who received the varicella vaccine within 28 days of the MMR vaccine, when compared to those who received the varicella vaccine more than 28 days after MMR vaccination. Clinical data are not available for all possible live vaccine combinations in all age groups.

MANAGEMENT: The U.S. Centers for Disease Control and Prevention's Advisory Committee on Immunization Practices generally recommends that doses of live, attenuated parenteral viral or bacterial vaccines that are not administered simultaneously (using different injection sites and separate needles and syringes for injectable products not formulated as combinations) should be separated by an interval of at least 28 days. If the live vaccines involved are separated by less than 4 weeks, the second vaccine administered should not be counted and the dose should be repeated at least 4 weeks later. Oral vaccines (e.g., Ty21a typhoid vaccine and rotavirus) can be administered simultaneously with or at any interval before or after other live vaccines if indicated. The United Kingdom's Green Book recommends always separating the YF and MMR vaccines by at least 4 weeks, unless rapid protection is required in which case they advise considering an additional dose of the MMR vaccine. Additionally, the Canadian Immunization Guide recommends avoiding simultaneous administration of a first-generation smallpox vaccine with a varicella-containing vaccine; suggesting that if both are needed, the varicella-containing vaccine should be given at least 4 weeks before or after the first-generation smallpox vaccine. Current local immunization guidelines and prescribing information for individual vaccines should be consulted for specific recommendations.

References (9)
  1. Public Health Agency of Canada (2025) Timing of vaccine administration: Canadian Immunization Guide. https://www.canada.ca/en/public-health/services/publications/healthy-living/canadian-immunization-guide-part-1-key-immunization-information/page-10-timing-vaccine-administration.html
  2. US Centers for Disease Control and Prevention (CDC) (2025) Timing and spacing of immunobiologics. https://www.cdc.gov/vaccines/hcp/imz-best-practices/timing-spacing-immunobiologics.html
  3. Staples JE, O'Laughlin K (2025) Yellow Fever https://www.cdc.gov/yellow-book/hcp/travel-associated-infections-diseases/yellow-fever.html#prevent
  4. UK Health Security Agency (2025) Contraindications and special considerations: the green book, chapter 6. https://www.gov.uk/government/publications/contraindications-and-special-considerations-the-green-book-chapter-6
  5. UK Health Security Agency (2025) Measles: the green book, chapter 21. https://www.gov.uk/government/publications/measles-the-green-book-chapter-21
  6. Australian Government. Department of Health and Aged Care (2025) Preparing for vaccination. https://immunisationhandbook.health.gov.au/contents/vaccination-procedures/preparing-for-vaccination
  7. Nascimento Silva JR, Camacho LA, Siqueira MM, et al. (2011) "Mutual interference on the immune response to yellow fever vaccine and a combined vaccine against measles, mumps and rubella." Vaccine, 29, p. 6327-34
  8. Boikos C, Papenburg J, Martineau C, et al. (2017) "Viral interference and the live-attenuated intranasal influenza vaccine: results from a pediatric cohort with cystic fibrosis." Hum Vacc Immunother, 13, p. 1254-60
  9. Vizzotti C, Harris JB, Aquino A, et al. (2025) Immune response to co-administration of measles, mumps, and rubella (MMR) and yellow fever vaccines: a randomized non-inferiority trial among one-year-old children in Argentina. https://pmc.ncbi.nlm.nih.gov/articles/PMC10021967/

Drug and food interactions

Moderate

amphetamine food

Applies to: Adderall XR (amphetamine / dextroamphetamine)

GENERALLY AVOID: Alcohol may potentiate the cardiovascular effects of amphetamines. The exact mechanism of interaction is unknown. In one study, concurrent administration of methamphetamine (30 mg intravenously) and ethanol (1 gm/kg orally over 30 minutes) increased heart rate by 24 beats/minute compared to methamphetamine alone. This increases cardiac work and myocardial oxygen consumption, which may lead to more adverse cardiovascular effects than either agent alone. Subjective effects of ethanol were diminished in the eight study subjects, but those of methamphetamine were not affected. The pharmacokinetics of methamphetamine were also unaffected except for a decrease in the apparent volume of distribution at steady state. The interaction was suspected in a case report of a 20-year-old male who experienced retrosternal chest pain shortly after drinking alcohol and taking a double dose of his amphetamine/dextroamphetamine medication (Adderall 15 mg X 2) to stay alert. The patient had no family history of cardiovascular diseases, and his past medical history was remarkable only for ADHD. Prior to the episode, the patient had not taken his medication for weeks and had been drinking whiskey the previous three nights before going to bed. The patient was diagnosed with myocardial infarction likely secondary to amphetamine-induced coronary vasospasm.

MANAGEMENT: Concomitant use of amphetamines and alcohol should be avoided if possible, especially in patients with a history of heart disease.

References (2)
  1. Mendelson J, Jones RT, Upton R, Jacob P 3rd (1995) "Methamphetamine and ethanol interactions in humans." Clin Pharmacol Ther, 57, p. 559-68
  2. Jiao X, Velez S, Ringstad J, Eyma V, Miller D, Bleiberg M (2009) "Myocardial infarction associated with Adderall XR and alcohol use in a young man." J Am Board Fam Med, 22, p. 197-201
Moderate

dextroamphetamine food

Applies to: Adderall XR (amphetamine / dextroamphetamine)

GENERALLY AVOID: Alcohol may potentiate the cardiovascular effects of amphetamines. The exact mechanism of interaction is unknown. In one study, concurrent administration of methamphetamine (30 mg intravenously) and ethanol (1 gm/kg orally over 30 minutes) increased heart rate by 24 beats/minute compared to methamphetamine alone. This increases cardiac work and myocardial oxygen consumption, which may lead to more adverse cardiovascular effects than either agent alone. Subjective effects of ethanol were diminished in the eight study subjects, but those of methamphetamine were not affected. The pharmacokinetics of methamphetamine were also unaffected except for a decrease in the apparent volume of distribution at steady state. The interaction was suspected in a case report of a 20-year-old male who experienced retrosternal chest pain shortly after drinking alcohol and taking a double dose of his amphetamine/dextroamphetamine medication (Adderall 15 mg X 2) to stay alert. The patient had no family history of cardiovascular diseases, and his past medical history was remarkable only for ADHD. Prior to the episode, the patient had not taken his medication for weeks and had been drinking whiskey the previous three nights before going to bed. The patient was diagnosed with myocardial infarction likely secondary to amphetamine-induced coronary vasospasm.

MANAGEMENT: Concomitant use of amphetamines and alcohol should be avoided if possible, especially in patients with a history of heart disease.

References (2)
  1. Mendelson J, Jones RT, Upton R, Jacob P 3rd (1995) "Methamphetamine and ethanol interactions in humans." Clin Pharmacol Ther, 57, p. 559-68
  2. Jiao X, Velez S, Ringstad J, Eyma V, Miller D, Bleiberg M (2009) "Myocardial infarction associated with Adderall XR and alcohol use in a young man." J Am Board Fam Med, 22, p. 197-201

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.


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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.