Zydelig

Generic name: idelalisib
Drug class: PI3K inhibitors

Medically reviewed by A Ras MD.

What is Zydelig?

Zydelig is a prescription medicine used to treat people with Chronic Lymphocytic Leukemia (CLL) in combination with rituximab when CLL comes back after prior cancer treatment and when rituximab treatment alone may be used due to other health problems.

It is also used to treat Follicular B-cell non-Hodgkin Lymphoma (FL) when the disease has come back after treatment with at least two prior medicines, Small Lymphocytic Lymphoma (SLL) when the disease comes back after treatment with at least two prior medicines.

Zydelig should not be used as the first medicine to treat people with CLL, FL, or SLL.
Zydelig should not be used in combination with bendamustine and/or rituximab to treat people with FL.
It is not known if Zydelig is safe and effective in children less than 18 years of age.

Description

Idelalisib is a kinase inhibitor. The chemical name for idelalisib is 5-fluoro-3-phenyl-2-[(1S)-1-(9H-purin-6-ylamino)propyl]quinazolin-4(3H)-one. It has a molecular formula of C22H18FN7O and a molecular weight of 415.42 g/mol. Idelalisib has the following structural formula:

Idelalisib is a white to off-white solid with a pH-dependent aqueous solubility ranging from <0.1 mg/mL at pH 5–7 to over 1 mg/mL at pH 2 under ambient conditions.

Zydelig (idelalisib) tablets are for oral use. Each tablet contains either 100 mg or 150 mg of idelalisib with the following inactive ingredients: microcrystalline cellulose, hydroxypropyl cellulose, croscarmellose sodium, sodium starch glycolate, magnesium stearate and a tablet coating. The tablet coating consists of polyethylene glycol, talc, polyvinyl alcohol, and titanium dioxide and of FD&C Yellow #6/Sunset Yellow FCF Aluminum Lake (for the 100 mg tablet) and red iron oxide (for the 150 mg tablet).

Mechanism of Action

Idelalisib is an inhibitor of phosphatidylinositol 3-kinase, PI3Kδ, which is expressed in normal and malignant B-cells. Idelalisib induced apoptosis and inhibited proliferation in cell lines derived from malignant B-cells and in primary tumor cells. Idelalisib inhibits several cell signaling pathways, including B-cell receptor (BCR) signaling and the CXCR4 and CXCR5 signaling, which are involved in trafficking and homing of B-cells to the lymph nodes and bone marrow. Treatment of lymphoma cells with idelalisib resulted in inhibition of chemotaxis and adhesion, and reduced cell viability.

What is the most important information I should know about Zydelig?

Zydelig can cause serious side effects that can lead to death, including:

Liver problems. Abnormal liver blood test results are common during treatment with Zydelig. Zydelig can cause severe liver problems. Your doctor will do blood tests before and during your treatment with Zydelig to check for liver problems. Tell your doctor right away if you get any of the following symptoms of liver problems:
- yellowing of your skin or the white part of your eyes (jaundice)
- dark or brown (tea colored) urine
- pain in the upper right side of your stomach area (abdomen)
- bleeding or bruising more easily than normal
Severe diarrhea. Diarrhea is common during treatment with Zydelig and can sometimes be severe. Tell your doctor right away if the number of bowel movements you have in a day increases by six or more. Ask your doctor about medicines you can take to treat your diarrhea.
Lung problems (pneumonitis). Your doctor may do tests to check your lungs if you have breathing problems during treatment with Zydelig. Tell your doctor right away if you get new or worsening cough, shortness of breath, difficulty breathing, or wheezing. Your doctor may treat you with a corticosteroid medicine if you develop lung problems.
Infections. Zydelig can cause serious infections that may lead to death. Tell your doctor right away if you have a fever or any signs of an infection during treatment with Zydelig.
Tear in intestinal wall (perforation). Tell your doctor or get medical help right away if you get new or worsening stomach area (abdomen) pain, chills, fever, nausea, or vomiting.
Severe skin reactions. Tell your doctor right away if you get any of the following symptoms during treatment with Zydelig:
- painful sores or ulcers on your skin, lips, or in your mouth
- severe rash with blisters or peeling skin
- rash with itching

If you have any of the above serious side effects during treatment with Zydelig, your doctor may completely stop your treatment, stop your treatment for a period of time, or change your dose of Zydelig.
See “What are the possible side effects of Zydelig?” for more information about side effects.

Who should not take Zydelig?

Do not take Zydelig if you have a history of serious allergic reactions including a severe skin reaction called toxic epidermal necrolysis (TEN).

What should I tell my healthcare provider before taking Zydelig?

Before taking Zydelig, tell your doctor about all of your medical conditions, including if you:

have liver problems
have lung problems
have an infection
are pregnant or plan to become pregnant. Zydelig may harm your unborn baby. Females who are able to become pregnant should have a pregnancy test before starting treatment with Zydelig.
- Females who are able to become pregnant should use effective birth control (contraception) during treatment with Zydelig and for at least 1 month after the last dose of Zydelig. Talk to your doctor about birth control methods that may be right for you. Tell your doctor right away if you become pregnant or think you are pregnant during treatment with Zydelig.
- Males with female partners who are able to become pregnant should use effective birth control (contraception) during treatment with Zydelig and for 3 months after the last dose.
are breastfeeding or plan to breastfeed. It is not known if Zydelig passes into your breast milk. Do not breastfeed during your treatment with Zydelig and for at least 1 month after the last dose.

Tell your doctor about all the medicines you take, including prescription and over-the-counter medicines, vitamins, and herbal supplements. Zydelig and certain other medicines may affect each other. Know the medicines you take. Keep a list of your medicines and show it to your doctor and pharmacist when you get a new medicine.

How should I take Zydelig?

Take Zydelig exactly as your doctor tells you to take it.
Your doctor may change your dose of Zydelig or tell you to stop taking Zydelig. Do not change your dose or stop taking Zydelig without first talking to your doctor.
Take Zydelig 2 times a day.
You may take Zydelig with or without food.
Take Zydelig tablets whole.
Do not miss a dose of Zydelig. If you miss a dose of Zydelig by less than 6 hours, take the missed dose right away. Then take your next dose as usual. If you miss a dose of Zydelig by more than 6 hours, wait and take the next dose of Zydelig at your usual time.

What are the possible side effects of Zydelig?

Zydelig can cause serious side effects, including:

See “What is the most important information I should know about Zydelig?”
Anaphylaxis. Tell your doctor or get medical help right away if you have a serious allergic reaction during treatment with Zydelig.
Low white blood cell count (neutropenia). Neutropenia is common during treatment with Zydelig and can sometimes be severe. Your doctor will check your blood counts regularly during treatment with Zydelig. Tell your doctor right away if you have a fever or any signs of an infection during treatment with Zydelig.

The most common side effects of Zydelig when used alone include:

tiredness
nausea
cough
fever
stomach area (abdomen) pain
pneumonia
rash

The most common side effects of Zydelig when used in combination with rituximab include:

pneumonia
fever
tiredness
rash
cough
nausea

Tell your doctor if you have any side effect that bothers you or that does not go away.
These are not all the possible side effects of Zydelig. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

General information about the safe and effective use of Zydelig

Medicines are sometimes prescribed for purposes other than those listed in a Medication Guide. Do not use Zydelig for a condition for which it was not prescribed. Do not give Zydelig to other people, even if they have the same symptoms you have. It may harm them. You can ask your doctor or pharmacist for information about Zydelig that is written for health professionals.

How should I store Zydelig?

Store Zydelig between 68°F to 86°F (20°C to 30°C).
Keep Zydelig in its original container.
Do not use Zydelig if the seal over the bottle opening is broken or missing.

Keep Zydelig and all medicines out of reach of children.

What are the ingredients in Zydelig?

Active ingredient: idelalisib

Inactive ingredients: microcrystalline cellulose, hydroxypropyl cellulose, croscarmellose sodium, sodium starch glycolate, and magnesium stearate. The tablet coating contains polyethylene glycol, talc, polyvinyl alcohol, titanium dioxide and FD&C Yellow #6 or Sunset Yellow FCF Aluminum Lake (for the 100 mg tablet) and red iron oxide (for the 150 mg tablet).

Label

PRINCIPAL DISPLAY PANEL – 100 MG TABLET BOTTLE LABEL

NDC 61958-1701-1

60 tablets
Zydelig®
(idelalisib) Tablets
100 mg
DISPENSER: Each time Zydelig® is dispensed
give the patient the attached Medication Guide.

PRINCIPAL DISPLAY PANEL – 150 MG TABLET BOTTLE LABEL

NDC 61958-1702-1
60 tablets
Zydelig®
(idelalisib) Tablets
150 mg
DISPENSER: Each time Zydelig® is dispensed
give the patient the attached Medication Guide.