Drug Safety-related Labeling Changes (SrLC)

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Drug Safety-related Labeling Changes (SrLC) Database

ANDA	Abbreviated New Drug Application
BLA	Biologics License Application
CDER	Center for Drug Evaluation and Research
MG	Medication Guide
NDA	New Drug Application
PCI	Patient Counseling Information
PI	Patient Information
PLR	Physician Labeling Rule
PLLR	Pregnancy and Lactation Labeling Rule
Italics	For the most part, italics indicate an FDA comment such as: Additions and/or revisions underlined These italics usually appear at the beginning of the section. In some cases, italics may be an inherent part of the label, and will most often appear in the body of the section.
Underlines	Any text that is underlined indicates text that has been added or revised. There are exceptions where underlining occurs in a section subtitle or heading. This is the case when there is just one word underlined in the body of the text.

Sections

BW	Box Warning
WP	Warnings and Precautions all in one section (PLR-format) Warnings as one section (pre-PLR format) Precautions as one section (pre-PLR format)
AR	Adverse Reactions (in pre-PLR format, this may be a subheading under precautions).
DI	Drug Interactions (in pre-PLR format, this may be a subheading under precautions).
USP	Use in Specific Populations (Inclusive on one or more of the following: Pregnancy; Lactation (PLLR- format); Nursing Mothers (pre-PLLR format); Females and Males of Reproductive Potential (PLLR format only); Pediatric Use, Geriatric Use, Renal Impairment, Hepatic Impairment, Sex, Race (these last six may be a subheading of precautions if label in pre-PLLR format.
PCI/PI/MG	Patient Counseling Information (PLR format only) - summarizes the information that a health care provider should convey to a patient (or caregiver when applicable) when a counseling discussion is taking place (e.g., a physician prescribing a drug during an office visit, a nurse providing discharge instructions at a hospital, or a pharmacist conveying information at a pharmacy). Patient Information - FDA approved patient labeling. Medication Guide - paper handouts that come with many prescription medicines. The guides address issues that are specific to particular drugs and drug classes, and they contain FDA-approved information that can help patients avoid serious adverse events.

Only NDAs and CDER regulated BLAs are included in this database. ANDAs are not included.

Applications that remain active, even if the product has been discontinued, undergo safety-related labeling changes.

MYCOBUTIN (NDA-050689)

(RIFABUTIN)

Safety-related Labeling Changes Approved by FDA Center for Drug Evaluation and Research (CDER)

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09/15/2021 (SUPPL-26)

Approved Drug Label (PDF)

7 Drug Interactions

Antiretroviral Drug Interactions

(Additions and/or revisions underlined)

Protease inhibitors act as substrates or inhibitors of CYP3A4 mediated metabolism. Therefore, due to significant drug-drug interactions between protease inhibitors and rifabutin, their concomitant use should be based on the overall assessment of the patient and a patient-specific drug profile. The concomitant use of protease inhibitors may require at least a 50% reduction in rifabutin dose, and depending on the protease inhibitor, an adjustment of the antiretroviral drug dose. Increased monitoring for adverse events is recommended when using these drug combinations (see PRECAUTIONS-Drug Interactions).

MYCOBUTIN is a CYP3A inducer. Co-administration with antiretroviral drugs metabolized by CYP3A, including but not limited to products containing bictegravir, rilpivirine, or doravirine may decrease plasma concentrations of those antiretroviral drugs, which may lead to loss of virologic response and possible development of resistance. Therefore, co-administration with antiretroviral drugs metabolized by CYP3A is not recommended or there may be a need to increase the dose of antiretroviral drugs (see PRECAUTIONS-Drug Interactions).

For further recommendations, please refer to the most recent prescribing information of the antiretrovirals or contact the specific manufacturer.

Addition of Biktarvy (bictegravir, tenofovir alafenamide, emtricitabine), doravirine, and Odefsey (rilpivirine, tenofovir alafenamide, emtricitabine), to Table 2, Rifabutin Interaction Studies; please refer to label)

03/08/2021 (SUPPL-25)

Approved Drug Label (PDF)

5 Warnings and Precautions

WARNINGS

Additions underlined

…

Severe Cutaneous Adverse Reactions

There have been reports of severe cutaneous adverse reactions (SCAR), such as Stevens-Johnson syndrome (SJS), toxic epidermal necrolysis (TEN), drug reaction with eosinophilia and systemic symptoms (DRESS), and acute generalized exanthematous pustulosis (AGEP) associated with MYCOBUTIN (see ADVERSE REACTIONS).

If patients develop a skin rash they should be monitored closely, and MYCOBUTIN discontinued if lesions progress. Specifically, for DRESS, a multi-system potential

life-threatening SCAR, time to onset of the first symptoms may be prolonged. DRESS is a clinical diagnosis, and its clinical presentation remains the basis for decision making. An early withdrawal of MYCOBUTIN is essential because of the syndrome’s mortality and visceral involvement (e.g., liver, bone marrow or kidney).

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6 Adverse Reactions

Additions underlined

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Adverse Reactions from Post-Marketing Experience

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Severe cutaneous adverse reactions (SCARs):

MYCOBUTIN has been associated with the occurrence of DRESS as well as other SCARs such as SJS, TEN, and AGEP (see WARNINGS).

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