Bicalutamide

Prostate Cancer Treatment

Bicalutamide is primarily used to treat metastatic prostate cancer (Stage D2). This is a type of cancer that has spread from the prostate gland to other areas of the body, such as the bones or lymph nodes.

Combination Therapy

This medication is not typically used alone. It is prescribed as part of a combination therapy alongside other drugs known as luteinizing hormone-releasing hormone (LHRH) analogs. These other medications help lower the amount of testosterone produced by the body.

Bicalutamide belongs to a class of drugs called nonsteroidal anti-androgens. It works by blocking the action of testosterone, a male hormone that many prostate cancer cells require to grow and spread. By blocking these hormones, the medication helps slow the progression of the disease.

Mechanism of Action

Bicalutamide belongs to a group of medicines called non-steroidal anti-androgens. It works by interfering with the way male hormones, such as testosterone, interact with prostate cancer cells.

Many types of prostate cancer rely on androgens to grow and spread. Bicalutamide works by:

• Blocking receptors: The medication attaches to specific proteins called androgen receptors on the surface of cancer cells.
• Preventing hormone binding: By occupying these receptors, it prevents testosterone and other male hormones from attaching to the cancer cells.
• Inhibiting cancer growth: Without the stimulation provided by these hormones, the growth of the cancer cells is slowed or stopped.

This medication is typically used as part of a combination therapy. While other treatments may work to lower the total amount of testosterone the body produces, bicalutamide ensures that any remaining hormones cannot effectively reach and stimulate the cancer cells.

Common Side Effects

Many people taking bicalutamide experience mild to moderate side effects. These may include:

• Hot flashes
• Breast swelling, tenderness, or pain
• Pain in the abdomen, back, or pelvic area
• Weakness or loss of strength
• Nausea, constipation, or diarrhea
• Swelling of the hands, feet, or lower legs
• Dizziness
• Increased urination at night or blood in the urine
• Weight gain or loss

Serious Side Effects

While less common, some side effects can be severe. Seek medical attention immediately for:

• Liver problems: Symptoms include yellowing of the skin or eyes (jaundice), dark-colored urine, nausea, vomiting, or pain in the upper right part of the stomach.
• Lung issues: New or worsening shortness of breath, cough, or fever.
• Allergic reactions: Hives, skin rash, itching, or swelling of the face, lips, tongue, or throat.
• Heart or chest symptoms: Chest pain or sudden shortness of breath.

Liver Toxicity

Bicalutamide has been associated with rare but severe liver injury, including cases of liver failure that have led to hospitalization or death. Healthcare providers typically perform liver function tests before starting treatment and at regular intervals during therapy. Immediate medical attention is necessary if symptoms of liver problems occur, such as:

• Yellowing of the skin or the whites of the eyes (jaundice)
• Dark-colored urine
• Persistent nausea or vomiting
• Pain in the upper right side of the stomach
• Unusual tiredness or loss of appetite

Blood Sugar Changes

A reduction in glucose tolerance has been observed in some patients taking this medication. This may lead to increased blood sugar levels or a higher risk of developing diabetes. Patients with a history of diabetes may require more frequent monitoring of their blood glucose levels.

Pregnancy and Fertility

Bicalutamide is not indicated for use in women and is contraindicated during pregnancy. Exposure to the drug during pregnancy may cause harm to a developing male fetus. Men with female partners of reproductive potential should use effective contraception during treatment and for 130 days after the final dose. The medication may also impair male fertility.

Photosensitivity

This medication can make the skin more sensitive to sunlight. It is often recommended to avoid excessive sun exposure, use sunscreen, and wear protective clothing while taking bicalutamide.

Monitoring

In addition to liver function tests, healthcare providers will monitor Prostate-Specific Antigen (PSA) levels to evaluate how the treatment is working.

Pregnancy and Contraception

Bicalutamide is not approved for use in women and is strictly contraindicated during pregnancy. Research indicates that exposure to this medication can cause fetal harm or birth defects. Women who are pregnant or may become pregnant should avoid handling or taking this medication.

Because the medication may be present in semen, men taking bicalutamide who have female partners of childbearing potential should take the following precautions:

• Use effective contraception, such as condoms, during the entire course of treatment.
• Continue using effective contraception for at least 130 days after the final dose of the medication.

Breastfeeding

Bicalutamide is not indicated for use in women. It is not known whether the drug is excreted in human breast milk. Due to the potential for serious adverse reactions in a nursing infant, the medication should not be used by individuals who are breastfeeding.

Available Forms

Bicalutamide is supplied as a film-coated tablet for oral use. It is intended to be swallowed whole and can be taken with or without food.

• Oral Tablet

FDA Approval and Indications

Bicalutamide was approved by the U.S. Food and Drug Administration (FDA) for use in combination therapy with a luteinizing hormone-releasing hormone (LHRH) analog. It is specifically indicated for the treatment of Stage D2 metastatic carcinoma of the prostate.

Safety and Regulatory Warnings

While bicalutamide does not carry a boxed warning, the FDA-approved labeling includes several important safety considerations and warnings:

• Hepatotoxicity: There have been reports of severe liver injury, including cases resulting in hospitalization or death, associated with bicalutamide use. The FDA Liver Toxicity Knowledge Base identifies the drug as having a known risk for drug-induced liver injury.
• Pregnancy and Gender: Bicalutamide is contraindicated for use in women and is not indicated for use in children. It can cause fetal harm if taken during pregnancy.
• Glucose Tolerance: Regulatory labels note that a reduction in glucose tolerance has been observed in males receiving LHRH agonists in combination with antiandrogens like bicalutamide. Periodic monitoring of blood glucose may be recommended.

There is currently no Risk Evaluation and Mitigation Strategy (REMS) required for this medication. It is available as a generic drug.

Generic Availability

Bicalutamide is the generic version of the brand-name drug Casodex. Generic medications are required to have the same active ingredients and effectiveness as brand-name drugs but are typically sold at a significantly lower price.

Insurance Coverage

Most health insurance plans, including Medicare Part D, provide coverage for generic bicalutamide. The specific out-of-pocket cost will depend on your insurance provider's formulary and your plan's copayment or coinsurance requirements.

Factors Influencing Price

The cost of bicalutamide can vary based on several factors, including:

• The pharmacy you choose (retail vs. mail-order).
• The quantity of tablets prescribed (e.g., a 30-day vs. 90-day supply).
• Whether you are using a pharmacy discount program or coupon.

Financial Assistance

If you are concerned about the cost of bicalutamide, you may be able to find assistance through pharmacy discount cards or non-profit organizations that help patients with medication costs. Comparing prices at different local pharmacies can also help identify the most affordable option.