Class Name(s):

• 10:00 Antineoplastic Agents

Pronunciation:

• (tra me' ti nib)

Brand Name(s):

• Mekinist^®

WHY is this medicine prescribed?

Trametinib is used alone or in combination with dabrafenib (Tafinlar) to treat certain types of melanoma (a type of skin cancer). It is also used in combination with dabrafenib to prevent the return of a certain type of melanoma after surgery. Trametinib is also used in combination with dabrafenib to treat certain types of non-small-cell lung cancer (NSCLC) and thyroid cancer. It is also used in combination with dabrafenib to treat certain types of solid tumors in adults and children 6 years of age older and to treat a certain type of glioma (a certain type of cancerous brain tumor) in children 1 year of age or older. Trametinib is in a class of medications called kinase inhibitors. It works by blocking the action of an abnormal protein that signals cancer cells to multiply. This helps stop the spread of cancer cells.

HOW should this medicine be used?

Trametinib comes as a tablet and a solution (liquid) to take by mouth. It is usually taken once a day on an empty stomach, at least 1 hour before or 2 hours after a meal. Take trametinib at around the same time every day. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take trametinib exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor. Do not stop taking trametinib without talking to your doctor.

Swallow the tablets whole; do not break or crush them. Tell your doctor if you cannot swallow the tablets whole.

If you vomit after you take trametinib, do not take another dose. Continue your regular dosing schedule.

Your doctor may adjust your dose of trametinib depending on your response to treatment and any side effects that you experience. Talk to your doctor about how you are feeling during your treatment.

Ask your pharmacist or doctor for a copy of the manufacturer's information for the patient.

Are there OTHER USES for this medication?

This medication may be prescribed for other uses; ask your doctor or pharmacist for more information.

What SPECIAL PRECAUTIONS should I follow?

Before taking trametinib,

• tell your doctor and pharmacist if you are allergic to trametinib, any other medications, or any of the ingredients in trametinib tablets or oral solution. Ask your pharmacist for a list of the ingredients.
• tell your doctor and pharmacist what other prescription and nonprescription medications, vitamins, nutritional supplements, and herbal products you are taking or plan to take.
• tell your doctor if you have or have ever had lung disease or breathing problems; diabetes; bleeding problems or blood clots; colitis (inflammation of the colon); stomach problems; high blood pressure; heart, eye, liver, or kidney disease; or any other medical conditions.
• tell your doctor if you are pregnant or plan to become pregnant. You should not become pregnant while you are taking trametinib. If you are female, you will need to have a pregnancy test before you start treatment, and you should use birth control to prevent pregnancy during your treatment and for 4 months after your final dose. Talk to your doctor about birth control methods that will work for you. If you are a male and your partner can become pregnant, you should use a condom while taking this medication, and for 4 months after your treatment, even if you have had a vasectomy (surgery to prevent sperm from leaving your body and causing pregnancy). If you or your partner become pregnant while taking trametinib, call your doctor. Trametinib may harm the fetus.
• tell your doctor if you are breastfeeding or plan to breastfeed. You should not breastfeed while taking trametinib and for 4 months after your final dose.
• you should know that this medication may decrease fertility in women. Talk to your doctor about the risks of taking trametinib.

What SPECIAL DIETARY instructions should I follow?

Unless your doctor tells you otherwise, continue your normal diet.

What should I do IF I FORGET to take a dose?

Take the missed dose as soon as you remember it. However, if it is less than 12 hours until your next scheduled dose, skip the missed dose and continue your regular dosing schedule. Do not take a double dose to make up for a missed one.

What SIDE EFFECTS can this medicine cause?

Trametinib may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:

• headache
• dry skin
• dry mouth
• vomiting
• diarrhea
• constipation
• loss of appetite
• change in ability to taste food
• tiredness
• joint, muscle, or back pain
• infection of the skin around the fingernails or toenails

Some side effects can be serious. If you experience any of these symptoms, stop taking trametinib and call your doctor immediately:

• unusual bleeding or bruising
• bloody or black, tarry stools
• coughing up or vomiting blood or material that looks like coffee grounds
• nosebleed
• stomach pain
• nausea
• fever
• chills
• rapid, irregular, or pounding heartbeat
• difficulty breathing
• chest pain
• swelling of the face, arms, legs, ankles, or feet
• dizziness, lightheadedness, or weakness
• shortness of breath
• leg pain, swelling, tenderness, redness, or warmth
• new or worsening cough
• blurred vision
• change in vision, including seeing halos (blurred outline around objects) or colored dots
• loss of vision
• eye pain
• dry, red, or swollen eyes
• rash, red skin, or pimples
• wart
• a reddish bump that bleeds or does not heal
• change in size or color of a mole
• itching
• blisters, ulcers, or sores on the skin, lips, or around the mouth or eyes
• tingling, burning, redness, swelling, peeling or flaking, blisters, or sores on the palms of the hands or soles of the feet
• swollen glands
• frequent urination
• increased thirst

Trametinib may increase the risk that you will develop new skin cancers or other cancers. Talk to your doctor about the risks of taking this medication.

Trametinib may cause other side effects. Call your doctor if you have any unusual problems while taking this medication.

If you experience a serious side effect, you or your doctor may send a report to the Food and Drug Administration's (FDA) MedWatch Adverse Event Reporting program online (http://www.fda.gov/Safety/MedWatch) or by phone (1-800-332-1088).

What should I do in case of OVERDOSE?

In case of overdose, call the poison control helpline at 1-800-222-1222. Information is also available online at http://www.poisonhelp.org/help. If the victim has collapsed, had a seizure, has trouble breathing, or can't be awakened, immediately call emergency services at 911.

Symptoms of overdose may include the following:

• vision problems

What should I know about STORAGE and DISPOSAL of this medication?

Keep this medication in the container it came in, tightly closed, away from moisture and light, and out of the reach of children. Do not place the tablets in other containers, such as daily or weekly pill boxes. Store it in a refrigerator, but do not freeze it. Do not remove the desiccant (small packet included with medication to absorb moisture) from your bottle.

Keep all medication out of sight and reach of children as many containers are not child-resistant. Always lock safety caps. Place the medication in a safe location - one that is up and away and out of their sight and reach. http://www.upandaway.org

Dispose of unneeded medications in a way so that pets, children, and other people cannot take them. Do not flush this medication down the toilet. Use a medicine take-back program. Talk to your pharmacist about take-back programs in your community. Visit the FDA's Safe Disposal of Medicines website http://goo.gl/c4Rm4p for more information.

What OTHER INFORMATION should I know?

Keep all appointments with your doctor and the laboratory. Your doctor will order certain lab tests before and during your treatment to see if it is safe for you to receive trametinib and to check your body's response to trametinib. Your doctor will also check your skin for any changes before you begin treatment, every 2 months during your treatment, and for up to 6 months after treatment. Your doctor will also check your blood pressure from time to time as needed.

Do not let anyone else take your medication. Ask your pharmacist any questions you have about refilling your prescription.

Keep a written list of all of the prescription and nonprescription (over-the-counter) medicines, vitamins, minerals, and dietary supplements you are taking. Bring this list with you each time you visit a doctor or if you are admitted to the hospital. You should carry the list with you in case of emergencies.

This report on medications is for your information only, and is not considered individual patient advice. Because of the changing nature of drug information, please consult your physician or pharmacist about specific clinical use.

The American Society of Health-System Pharmacists, Inc. represents that the information provided hereunder was formulated with a reasonable standard of care, and in conformity with professional standards in the field. The American Society of Health-System Pharmacists, Inc. makes no representations or warranties, express or implied, including, but not limited to, any implied warranty of merchantability and/or fitness for a particular purpose, with respect to such information and specifically disclaims all such warranties. Users are advised that decisions regarding drug therapy are complex medical decisions requiring the independent, informed decision of an appropriate health care professional, and the information is provided for informational purposes only. The entire monograph for a drug should be reviewed for a thorough understanding of the drug's actions, uses and side effects. The American Society of Health-System Pharmacists, Inc. does not endorse or recommend the use of any drug. The information is not a substitute for medical care.

AHFS^® Patient Medication Information™ Copyright, 2025. The American Society of Health-System Pharmacists^®, 4500 East-West Highway, Suite 900, Bethesda, Maryland. All Rights Reserved. Duplication for commercial use must be authorized by ASHP.

Selected Revisions: June 15, 2023.