Ayvakit
Generic name: Avapritinib
Dosage form: tablets
Drug class:
Multikinase inhibitors
Usage of Ayvakit
Ayvakit is a prescription medicine used to treat adults with certain types of gastrointestinal stromal tumor (GIST) and systemic mastocytosis (SM).
Ayvakit contains a drug called avapritinib, which belongs to the class of medicines called tyrosine kinase inhibitors.
GIST is a cancer of the gastrointestinal tract most often caused by mutations in the platelet-derived growth factor receptor alpha (PDGFRA) protein, which is part of a family of proteins called receptor tyrosine kinases (RTKs). Avapritinib works to treat GIST harboring a PDGFRA exon 18 mutation, including PDGFRA D842V mutations, by specifically targeting the mutant PDGFRA.
Systemic mastocytosis is a disorder characterized by the build up of mast cells in the body. It is most often caused by a D816V mutation in the KIT gene. Avapritinib works to treat advanced systemic mastocytosis (AdvSM) and indolent systemic mastocytosis (ISM) by specifically targeting KIT D816V.
Ayvakit side effects
Ayvakit may cause serious side effects, including:
Bleeding in your brain. Serious bleeding in the brain may happen during treatment with Ayvakit and may lead to death. Stop treatment and tell your healthcare provider right away if you develop any symptoms such as severe headache, vomiting, drowsiness, dizziness, confusion, or severe weakness on one or more side of your body. If you have AdvSM, your healthcare provider will check your platelet counts before and during treatment with this medicine.
Bleeding in the brain has not been seen in people treated with Ayvakit for ISM.
Cognitive effects. Cognitive side effects are common and can be severe. Tell your healthcare provider if you develop any new or worsening cognitive symptoms including:
Skin sensitivity to sunlight (photosensitivity).
The most common side effects in people with GIST include:
The most common side effects in people with AdvSM include:
The most common side effects in people with ISM include:
Your healthcare provider may change your dose, temporarily stop, or permanently stop treatment if you develop certain side effects.
Ayvakit may cause fertility problems in females and may decrease sperm production in males, which may affect your ability to have a child. Talk to your healthcare provider if this is a concern for you.
These are not all of the possible side effects.
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
Before taking Ayvakit
Before you start treatment, tell your healthcare provider about all of your medical conditions.
Pregnancy
Tell your healthcare provider if you are pregnant or plan to become pregnant. Ayvakit can cause harm to your unborn baby. Females who are able to become pregnant:
Males with female partners who are able to become pregnant should use effective birth control (contraception) during treatment, and for 6 weeks after the final dose.
Breastfeeding
Tell your healthcare provider if you are breastfeeding or plan to breastfeed. It is not known if this medicine passes into your breast milk. Do not breastfeed during treatment, and for at least 2 weeks after the final dose. Talk to your healthcare provider about the best way to feed your baby during this time.
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How to use Ayvakit
Usual Adult Dose for Gastrointestinal Stromal Tumor (GIST):
300 mg orally once a day until disease progression or unacceptable toxicity. Comments: - select patients for treatment based on the presence of a PDGFRA exon 18 mutation. Use: - for the treatment of adults with unresectable or metastatic GIST harboring a platelet-derived growth factor receptor alpha (PDGFRA) exon 18 mutation, including PDGFRA D842V mutations.
Usual Adult Dose for Advanced Systemic Mastocytosis (AdvSM):
200 mg orally once a day until disease progression or unacceptable toxicity.
Use: - for the treatment of adult patients with AdvSM. AdvSM includes patients with aggressive systemic mastocytosis (ASM), systemic mastocytosis with an associated hematological neoplasm (SMAHN), and mast cell leukemia (MCL). Limitations of Use: not recommended for the treatment of patients with AdvSM with platelet counts of less than 50 X 109 /L
Usual Adult Dose for Indolent Systemic Mastocytosis (ISM):
25 mg orally once a day. Use: - for the treatment of adult patients with ISM. Limitations of Use: not recommended for the treatment of patients with ISM with platelet counts of less than 50 X 109 /L
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