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# Attenuated Drugs
## Overview
Attenuated drugs are live vaccines where the pathogen has been weakened or modified to reduce its virulence while still eliciting an immune response.
## Primary Indications
Prevention of infectious diseases caused by specific pathogens (e.g., measles, mumps, rubella, varicella, rotavirus, live attenuated influenza vaccine (LAIV), Japanese encephalitis, yellow fever, typhoid fever).
## Adult Dosing
Dosing is typically a single dose or a series of doses as per the specific vaccine's recommendations. Refer to the specific vaccine's prescribing information for exact dosing and schedule.
## Pediatric Dosing
Dosing is age-dependent and follows the recommended childhood immunization schedule. Refer to the specific vaccine's prescribing information and the CDC's recommended immunization schedules for children and adolescents for exact dosing and schedule.
## Dose Adjustments
No dose adjustments are typically made based on organ function. However, vaccination may be deferred in certain immunocompromised individuals or those with acute moderate or severe febrile illness.
## Contraindications
* Severe allergic reaction (anaphylaxis) to a previous dose of the vaccine or any component of the vaccine, including neomycin or gelatin (for some vaccines).
* Primary and secondary immunodeficiency states (e.g., congenital immunodeficiency, acquired immunodeficiency syndrome (AIDS) or symptomatic HIV infection, chemotherapy, long-term steroid use). Specific contraindications vary by vaccine.
* Pregnancy (for certain vaccines like MMR and varicella).
* Recent receipt of blood products or immunoglobulin (may interfere with the immune response; specific waiting periods apply).
## Adverse Effects
Common: Fever, rash, injection site reactions (pain, redness, swelling).
Less Common: Febrile seizures, thrombocytopenia, lymphadenopathy.
Rare: Encephalitis, anaphylaxis.
## Key Drug Interactions
* **Immunosuppressants:** Concomitant use with immunosuppressive medications may reduce the immune response to the vaccine. Vaccination should be delayed until immunosuppressive therapy is completed.
* **Blood Products/Immunoglobulin:** May interfere with the live virus replication and diminish the vaccine's effectiveness. Intervals are vaccine-specific.
## Monitoring
Monitor for signs of allergic reaction (anaphylaxis) for 15-30 minutes post-vaccination. Monitor for expected common adverse effects.
## Clinical Pearls
* Live attenuated vaccines are generally contraindicated in individuals who are severely immunocompromised.
* Vaccination may be deferred until immunosuppressive therapy is discontinued.
* For vaccines that require multiple doses, ensure adherence to the recommended schedule to achieve optimal immunity.
* LAIV is generally not recommended for individuals with contraindications to intranasal administration (e.g., asthma in children 2-4 years, pregnant women).
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*Please verify this information with the current prescribing information for the specific attenuated vaccine product and local protocols before administration.*
