

Cotellic (Cobimetinib) is a targeted cancer therapy used to treat certain cancers in adults, including advanced melanoma and histiocytic neoplasms. It belongs to a class of medications known as MEK inhibitors, which block specific proteins involved in cancer cell growth and survival.
For histiocytic neoplasms, this medication is used alone. For melanoma, it is taken together with another anticancer medication to treat tumors that have a specific genetic change called a BRAF mutation.
Below is a quick overview of important Cotellic facts for patients and caregivers:
| Brand Name | Cotellic |
|---|---|
| Active Ingredient | Cobimetinib |
| Strengths Available | 20 mg |
| Drug Class | MEK (kinase) inhibitor |
| Available Form | Tablets |
| FDA-Approved | Yes |
| Primary Use | Advanced melanoma, histiocytic neoplasms |
| Route of Administration | Oral |
| Storage | Store at room temperature (below 30°C / 86°F) |
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All Cotellic orders require a valid prescription and are fulfilled by licensed Canadian pharmacies that follow strict quality and safety standards.
Cotellic is prescribed in combination with vemurafenib to treat certain types of melanoma skin cancer with specific BRAF gene mutations. It is primarily used for:
Unresectable or Metastatic Melanoma:
Cotellic is used in combination with vemurafenib to treat melanoma that:
Histiocytic Neoplasms:
Cotellic is approved as a single agent for the treatment of adult patients with certain histiocytic neoplasms.
Note: For melanoma treatment, testing for BRAF V600E or V600K mutations is required before starting Cotellic.
Cotellic 20 mg works by blocking MEK1 and MEK2 enzymes that are part of a signaling pathway responsible for cancer cell growth. In tumors with BRAF mutations, this pathway becomes overactive and causes uncontrolled cancer progression. By inhibiting MEK proteins, Cotellic helps slow tumor growth and improve treatment response, especially when combined with vemurafenib.
The recommended dosage of Cotellic is taken in repeating 28-day treatment cycles as shown below:
| Treatment Period | Recommended Dosage |
|---|---|
| Days 1-21 | 60 mg once daily (three 20 mg tablets taken by mouth) |
| Days 22-28 | No medication (7 days off treatment) |
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This 21-day-on/7-day-off cycle is continued until disease progression or unacceptable side effects occur.
Here is some important dosage information:
Missed dose or vomiting:
If a dose is missed or vomiting occurs after taking Cotellic, do not take an additional dose. Resume treatment with the next scheduled dose.
In some cases, doctors may reduce the dosage due to side effects or drug interactions:
| Adjustment Level | Modified Dose |
|---|---|
| First reduction | 40 mg once daily |
| Second reduction | 20 mg once daily |
| If unable to tolerate 20 mg | Cotellic is permanently discontinued |
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Dose changes are determined by a healthcare provider based on safety and tolerance.
Cotellic may cause different side effects depending on the condition being treated. Some effects are common and mild, while others may be serious and require medical attention. Commonly reported Cotellic side effects are listed below:
In adults treated for unresectable or metastatic melanoma, the most commonly reported side effects include:
In adults treated for histiocytic neoplasms, commonly reported side effects include:
Although these are less common, some side effects can be serious. Seek immediate medical care if you experience:
If any serious side effects are suspected, stop taking the medication and seek immediate medical support or contact a poison control center for guidance.
Cotellic is a targeted cancer therapy that may cause serious side effects. Patients should be monitored during treatment to reduce risks and ensure safe use.
To ensure effectiveness and safety during treatment, patients should follow these precautions:
This medication may lead to the following serious medical conditions:
Seek immediate medical help if any serious symptoms occur.
Cotellic can make your skin extremely sensitive to sunlight. To protect yourself:
Cotellic can cause harm to an unborn baby.
There are no adequate studies in pregnant women, but animal studies showed fetal harm.
Breastfeeding is not recommended during treatment and for 2 weeks after stopping Cotellic, as serious side effects in infants may occur. Always consult a healthcare provider before use.
Cotellic can interact with medications that affect certain liver enzymes (CYP3A), which may increase side effects or reduce treatment effectiveness. Always consult a healthcare provider before combining Cotellic with other medications. Medications that may interact include:
Some medications can significantly increase Cotellic levels in the body, while others may lower its effectiveness.
Depending on the type of cancer and genetic mutation involved, healthcare providers may consider other targeted therapy options.
| Alternative Product | Active Ingredient | Common Use | Form |
|---|---|---|---|
| Mektovi | Binimetinib | BRAF-mutated melanoma | Tablets |
| Mekinist | Trametinib | BRAF-related cancers | Tablets |
| Braftovi combinations | Encorafenib with MEK inhibitors | Advanced melanoma | Tablets |
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Note: Treatment choice depends on genetic test results, cancer type, and the individual patient's response. A doctor should determine the most appropriate alternative.
Buying prescription cancer medications from local U.S. pharmacies can be extremely expensive. Ordering Cotellic online from Polar Bear Meds helps reduce overall treatment costs while maintaining quality and safety standards.
Note: A valid prescription from a licensed healthcare provider is required to purchase Cotellic 20 mg.
This content is for informational purposes only and does not replace expert medical guidance, diagnosis, or treatment. Cotellic is a prescription medication used to treat certain types of melanoma skin cancer. Always consult an authorized healthcare professional before starting, stopping, or changing the dosage of Cotellic. Individual results, side effects, and dosing needs may vary.

Dr. Jackson Miller is a board-certified medicine physician & hospitalist. He is a healthcare professional with a strong background in patient care. With years of experience and a patient-first approach, he believes the foundation of good health is a patient who feels informed and empowered. He contributes to medical content review, drawing on his background in clinical practice and patient education. He focuses on presenting health information in a clear, accurate, and accessible way to help readers make informed decisions. His work emphasizes clarity, evidence-based guidance, and understandable explanations of medical topics.
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