Temsirolimus

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Temsirolimus

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Medically reviewed

Marina Burgos

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Temsirolimus

Quick Facts

Property Description
Active ingredient Temsirolimus (CCI-779)
Form Concentrated solution for infusion
Pharmacological class mTOR Inhibitor
General purpose Targeted therapy for conditions involving uncontrolled cell growth
Origin Synthetic derivative of the macrolide sirolimus

Temsirolimus, commercially known as Torisel, is a powerful, highly specific synthetic antineoplastic agent developed for targeted therapy. Its chemical structure classifies it as a rapamycin derivative and an ester of sirolimus, placing it in the pharmacological class of mammalian Target of Rapamycin (mTOR) inhibitors.


What Type of Medicine is Temsirolimus?

Temsirolimus is a single-active-ingredient medicine that functions as an mTOR inhibitor, meaning it targets a critical enzyme responsible for regulating cell growth. The compound, known chemically as CCI-779, is a synthetic derivative of the naturally occurring macrolide sirolimus. This targeted approach is a recognized strategy for influencing cellular proliferation. Its high-level therapeutic purpose is to act as a cytostatic agent by intervening directly with signals that drive excessive cellular multiplication, thereby aiming to stabilize or slow disease progression in targeted patient groups.


Composition and Physical Form

The medication is supplied as a concentrated solution for infusion, which is the official dosage form. This choice of intravenous (IV) administration is a key differentiating factor from other related mTOR inhibitors (like everolimus, which is an oral tablet) and is necessary to ensure predictable and complete drug delivery. The product is a sterile solution containing the active drug dissolved in a non-aqueous base that typically includes excipients like dehydrated alcohol and polysorbate 80, which facilitate the formulation's required parenteral delivery.


General Function: Targeting Cellular Growth Signals

The general purpose of Temsirolimus is to manage conditions characterized by uncontrolled cell proliferation by interfering with the cell's basic growth machinery. It achieves this by the selective inhibition of mTOR, effectively acting as a specific brake that prevents cells from receiving the command to grow and divide. This action forces cells into a state of G1-phase cell cycle arrest, disrupting their multiplication and offering a focused approach to stabilize the underlying condition. This targeted action functions as a strategic way to inhibit cellular growth.

Regulatory References

  1. NIH: Temsirolimus (NCI Drug Dictionary)

What side effects are possible with Temsirolimus?

Possible side effects and safety information

The safety profile of Temsirolimus is derived from regulatory classifications that organize adverse reactions by frequency and physiological system, based strictly on government documents such as the FDA Prescribing Information and the EMA Summary of Product Characteristics.

Frequency-Classified Adverse Reactions

Many documented adverse events are classified as Very Common (occurring in 10% or more of patients). These frequently reported effects often involve multiple body systems and include systemic reactions such as asthenia (fatigue), rash, mucositis (mouth sores), edema (swelling), nausea, and diarrhea. Common laboratory abnormalities also documented in this category are anemia, hyperglycemia (high blood sugar), and hyperlipidemia (high cholesterol/triglycerides), reflecting the drug’s impact on Metabolism and Nutrition Disorders.

Serious Adverse Reactions and Safety Constraints

The regulatory safety profile highlights several serious adverse reactions, some of which have resulted in fatal outcomes in documented cases. These include Interstitial Lung Disease (ILD), severe Infections (including opportunistic types), Renal Failure, and events like Bowel Perforation and Intracerebral Hemorrhage. Hypersensitivity reactions, including rare fatal anaphylaxis, are noted to occur, sometimes very early in the first infusion.

For specific patient populations, safety constraints apply. An increased rate of fatal events has been observed in patients with moderate to severe hepatic (liver) impairment, which leads to specific contraindications and cautions. Furthermore, the potential for Embryo-Fetal Toxicity is documented, requiring safety measures for women of childbearing potential. Caution is also noted regarding the potential for Abnormal Wound Healing and the risk of Angioedema when Temsirolimus is used alongside ACE inhibitors.

Overdose and Emergency Response

Overdose and When to Seek Help

Regulatory documentation describes the Temsirolimus overdose profile as being associated with an increased incidence and severity of serious adverse events when doses exceed the standard 25 mg regimen. Official labeling states that no specific treatment or antidote is known for Temsirolimus intravenous overdose.

Documented Manifestations of High-Dose Exposure

The most serious manifestations observed in regulatory reporting are dose-dependent and include an increased risk of specific adverse events across multiple body systems:

  • Vascular: Thrombosis (blood clot formation).
  • Gastrointestinal: Bowel perforation (a hole in the intestine).
  • Central Nervous System (CNS): Seizure and Psychosis.
  • Pulmonary: Interstitial Lung Disease (ILD).

Required Emergency Actions

The presence of severe, life-threatening symptoms associated with suspected overdose, such as difficulty breathing, seizures, or signs of bowel perforation (e.g., bloody stools, fever, abdominal pain), necessitates immediate intervention. Government guidance instructs that emergency medical attention must be sought immediately, and emergency services should be contacted for severe events like collapse or trouble breathing. Management of suspected overdose is limited to symptomatic and supportive treatment within a hospital setting.

Therapeutic Uses of Temsirolimus

What Temsirolimus Treats: Main Uses and Benefits

Temsirolimus is generally used in oncology to help manage conditions presenting with systemic or localized discomfort associated with advanced malignancies. The medication's primary role is to address symptoms related to systemic imbalance and conditions where functional stability becomes affected.

Management of Advanced Cancers

This domain covers the medication's primary use as a systemic treatment for adult patients diagnosed with advanced or metastatic renal cell carcinoma (RCC), particularly those categorized as having an aggressive poor prognostic risk status. The medication is also applied in addressing aggressive hematologic conditions, such as mantle cell lymphoma (MCL), when the disease has returned or proved resistant to previous therapies. The therapeutic purpose may assist with maintaining functional stability by helping to slow the rate of symptom intensification in these condition categories.

Supportive Relief

It is commonly used to help with maintaining a sense of stability during periods of heightened symptoms. This approach helps maintain a sense of stability when symptoms are more noticeable and contributes to easing the overall symptom load associated with widespread disease activity. This medication may be part of symptomatic management by supporting the patient during episodes of heightened systemic burden.


QuickFact Block

Quick Fact: Relief for Widespread Disease
Therapeutic Target: Systemic disease activity in aggressive cancers, including advanced renal cell carcinoma and relapsed/refractory mantle cell lymphoma.
Primary Benefit: Supports general well-being and helps maintain a sense of stability by helping to slow the rate of symptom intensification.

Eligibility and Restrictions for Use

Temsirolimus (Torisel) is an intravenous medicine used only by adults who meet specific health criteria, as defined in official regulatory documents (e.g., FDA, EMA).

Populations that Must Not Use Temsirolimus (Contraindicated)

Classification Restriction Regulatory Basis (Example)
Hypersensitivity Known allergy to temsirolimus, its metabolite sirolimus, polysorbate 80, or any other component. FDA / EMA
Severe Liver Impairment Patients with high baseline bilirubin (e.g., > 1.5 times the Upper Limit of Normal). FDA

Populations with Restricted or Conditional Use

Population / Condition Restriction Type
Pregnancy / Fetal Risk Absolute avoidance; female and male patients of reproductive potential must use effective contraception during treatment and for 3 months after the last dose.
Breastfeeding Not recommended; discontinuation of nursing is advised during and for 3 weeks after treatment.
Mild-to-Moderate Liver Impairment Use requires caution and often a dose reduction (e.g., if bilirubin is >1.0 to 1.5 times ULN).
Severe Kidney Impairment Use requires caution.
Pediatric Patients Use is not recommended due to a lack of established efficacy in the treatment of certain pediatric tumors.

These official regulatory eligibility rules establish absolute non-eligibility for certain groups, primarily based on the severity of liver function and hypersensitivity. Other populations, such as those with existing hyperglycemia, hyperlipidemia, or in the perioperative period, require special caution and continuous monitoring to maintain conditional eligibility, as specified in the authoritative prescribing information.

What should I know about interactions with other medicines?

Temsirolimus, and its active metabolite sirolimus, are metabolized by the Cytochrome P450 3A4 (CYP3A4) enzyme system. This means that certain other medicines or products can affect the amount of temsirolimus in the blood, potentially changing its effects and side effects.

Strong inhibitors of CYP3A4 can increase the concentration of the active metabolite, sirolimus. Strong inhibitors include certain antifungals (e.g., ketoconazole, itraconazole, voriconazole), antivirals, and some antibiotics (e.g., clarithromycin). Strong inducers of CYP3A4 can decrease the concentration of the active metabolite, sirolimus. Strong inducers include certain anticonvulsants (e.g., carbamazepine, phenytoin, phenobarbital), and rifampin.

Patients should avoid the following while taking temsirolimus:

Category Examples
Strong CYP3A4 Inhibitors Ketoconazole, Atazanavir, Grapefruit juice
Strong CYP3A4 Inducers Rifampin, Phenytoin, St. John's Wort

Simultaneous use of temsirolimus with Angiotensin-Converting Enzyme (ACE) inhibitors (e.g., ramipril) or Calcium Channel Blockers (CCB) (e.g., amlodipine) has been associated with an increased risk of angioedema (swelling beneath the skin, often in the face or throat). Additionally, due to its immunosuppressive effects, live vaccines should be avoided during treatment and close contact with individuals who have recently received a live vaccine should be avoided.

Mechanism of Action

Allosteric Inhibition of the mTORC1 Complex

Temsirolimus intervenes in core biological processes that govern cellular growth and proliferation, leading to a cytostatic (growth-slowing) physiological effect. The drug targets the mechanistic Target of Rapamycin (mTOR), a crucial enzyme complex that integrates growth and metabolic signals. Temsirolimus first binds to the intracellular protein FKBP12, and this conjugate then allosterically blocks the function of mTOR Complex 1 (mTORC1). This inhibitory event directly blocks the major signaling cascade responsible for driving cellular multiplication.

Inducing G1-Phase Cell Cycle Arrest

The resulting mTORC1 inhibition halts the phosphorylation of critical downstream proteins, specifically S6 Kinase and 4EBP1, interrupting the cell's machinery for protein synthesis. This promotes cells to stop their division process, resulting in G1-phase cell cycle arrest. This action is further complemented by the suppression of Hypoxia-Inducible Factors (HIFs), which results in an anti-angiogenic effect by reducing the formation of new blood vessels. The mechanism is predominantly selective for mTORC1, which can trigger a compensatory activation of upstream survival signals via the AKT pathway, representing an intrinsic physiological constraint.

Dosage and Administration Information

How to Use Temsirolimus

Temsirolimus is an anticancer agent administered strictly as a concentrated solution for intravenous (IV) infusion. The medicine is given on an intermittent once-weekly schedule, and its administration requires strict adherence to established preparation and procedural guidelines.

Official Dosing and Frequency

Indication Standard Adult Dosing Schedule Frequency
Advanced Renal Cell Carcinoma (RCC) 25 mg Once Weekly
Mantle Cell Lymphoma (MCL) (EU/UK Label) 175 mg for 3 weeks, then 75 mg maintenance Once Weekly

Key Administration Principles

The infusion is typically delivered over a period of 30 to 60 minutes. Before each dose, patients must receive mandatory intravenous premedication, typically 25 to 50 mg of diphenhydramine or an equivalent antihistamine, administered approximately 30 minutes in advance.

Preparation involves a required two-step dilution process: the drug concentrate is first mixed with the supplied diluent before being further diluted in 250 mL of 0.9% saline for final infusion. The concentrate must not be added directly to aqueous solutions. Treatment is generally continued until disease progression or unacceptable toxicity is observed.

Population-Specific Adjustments

In cases of known hepatic impairment, the standard weekly dose must be reduced. For mild hepatic impairment, the dose is reduced to 15 mg weekly. For severe hepatic impairment in RCC, a further reduction to 10 mg weekly may be required. No dose adjustment is generally necessary for patients with renal impairment.

Recent Clinical Evidence

Temsirolimus: Recent Clinical Evidence

Clinical research has focused on the use of Temsirolimus as a treatment for advanced renal cell carcinoma (RCC) and relapsed or refractory mantle cell lymphoma (MCL). Studies of this medication, which is categorized as a mammalian target of rapamycin (mTOR) inhibitor, evaluate its influence on disease progression and survival in specific patient groups.


Advanced Renal Cell Carcinoma (RCC)

A pivotal Phase 3 trial assessed temsirolimus in patients with previously untreated advanced RCC who had multiple unfavorable prognostic factors. The study compared single-agent temsirolimus to interferon-alpha (IFN- alpha) and a combination of both agents.

  • Survival: Patients who received single-agent temsirolimus demonstrated a statistically longer median overall survival compared to those receiving IFN- alpha alone.
  • Progression-Free Survival (PFS): Findings for the temsirolimus group indicated a longer median PFS compared to the IFN- alpha group.

Relapsed or Refractory Mantle Cell Lymphoma (MCL)

A Phase 3 study evaluated two different temsirolimus regimens compared with physician's choice of single-agent therapy in patients with relapsed or refractory MCL who had received previous treatments.

  • Progression-Free Survival (PFS): One specific high-dose regimen of temsirolimus was associated with significantly longer median PFS compared to the physician's choice therapy.
  • Objective Response Rate (ORR): This high-dose temsirolimus regimen also showed a significantly higher ORR than the investigator's choice arm.

Safety Monitoring in Research

Across both indications, the most frequent high-grade adverse events recorded in the temsirolimus study groups included hematological toxicities (such as thrombocytopenia and anemia), asthenia (weakness), and stomatitis (mouth sores). These events were typically managed through supportive care and dose modifications. Research studies monitor the occurrence of these events to characterize the treatment's profile.

Frequently Asked Questions (FAQ)

Common questions about Temsirolimus (FAQ)


Q: Is Temsirolimus considered a type of chemotherapy?

A: Temsirolimus is officially classified as a targeted therapy and a specific type of drug called an mTOR inhibitor. Unlike traditional chemotherapy, which attacks all rapidly dividing cells, targeted therapies work by interfering with specific pathways, like the mTOR pathway, that help cancer cells grow and divide. This mechanism is considered distinct from conventional cytotoxic chemotherapy.


Q: Is it normal to feel very tired while taking Temsirolimus?

A: Yes, feeling very tired or weak, known as asthenia, is a common adverse reaction associated with Temsirolimus. According to official product information, asthenia is classified as a 'very common' side effect, affecting a significant portion of patients in clinical trials. Concerns about fatigue should be addressed with the patient's healthcare provider.


Q: Does Temsirolimus cause hair loss?

A: Hair loss (alopecia) is a reported adverse reaction in clinical trials for Temsirolimus. However, it is not listed among the 'very common' side effects (those occurring in 10% or more of patients) in the official safety profile. Other side effects like rash and swelling are typically more frequently reported.


Q: Can Temsirolimus affect my blood pressure?

A: Official prescribing information indicates that Temsirolimus can be associated with hypertension (high blood pressure). Additionally, regulatory documents warn that using Temsirolimus alongside certain blood pressure medications, such as ACE inhibitors, may increase the risk of angioedema (swelling beneath the skin).


Q: What happens if I forget a dose of Temsirolimus?

A: Temsirolimus is administered on a strict weekly schedule as an intravenous infusion by a healthcare professional. Because of this, patients are advised to contact their treating physician or clinic immediately if a scheduled infusion is missed, to discuss rescheduling.


Q: Can Temsirolimus interact with over-the-counter pain relievers?

A: Temsirolimus interacts with medicines that affect the CYP3A4 enzyme system. While official documents focus on strong inhibitors and inducers, they do not individually list all over-the-counter pain relievers. Patients should review all medicines, including over-the-counter products and supplements, with a healthcare professional to check for potential interactions.


Q: Does alcohol interact dangerously with Temsirolimus?

A: Official regulatory guidance advises patients to avoid the use of alcohol while receiving Temsirolimus treatment. The medication itself is formulated with dehydrated alcohol as an excipient, and consuming additional alcohol may lead to potential interaction concerns.


Q: Is it normal to have a change in taste while on Temsirolimus?

A: A change in taste, medically referred to as dysgeusia, is a reported adverse effect that has been observed in clinical trials of Temsirolimus. While it is not always classified among the most frequent side effects, it is a recognized potential issue.


Q: Can Temsirolimus affect my liver test results?

A: Yes, Temsirolimus can impact liver function. Regulatory information recommends the periodic assessment of liver enzymes and bilirubin levels during therapy. Patients with existing hepatic (liver) impairment may require dose adjustment or special caution.


Q: How long do you usually stay on Temsirolimus treatment?

A: According to official drug administration guidelines, Temsirolimus treatment is intended to continue on a weekly basis until one of two conditions occurs: either the underlying disease progresses, or the patient experiences unacceptable toxicity (side effects that are too severe to manage).


Q: Can older patients (seniors) take Temsirolimus?

A: Temsirolimus is approved for use in the adult population. Official information notes that geriatric patients (65 years and older) may be more likely to experience certain adverse reactions compared to younger adults and, therefore, require careful monitoring.


Q: Can Temsirolimus cause problems with wound healing?

A: Yes, Temsirolimus may interfere with normal wound healing. Regulatory warnings specifically mention the potential for abnormal wound healing. Patients who require surgery should ensure their healthcare team is informed about their Temsirolimus treatment, as special consideration may be necessary.


Q: Is Temsirolimus a drug that weakens the immune system?

A: Temsirolimus is known to have effects that suppress the immune system. This is inferred from the increased risk of infections, including serious and opportunistic types, and the official guidance to avoid live vaccines during treatment.


Q: Does Temsirolimus have a generic version available?

A: Yes, while the original product is branded as Torisel, the active ingredient Temsirolimus is also available as a generic injection. The availability of the generic form can vary.


Q: Do you need a special diet while undergoing Temsirolimus treatment?

A: While a specific 'special diet' is not generally prescribed, there are important restrictions and monitoring requirements. Patients are instructed to avoid grapefruit and grapefruit juice due to a serious drug interaction risk. Furthermore, since Temsirolimus can affect blood sugar and cholesterol levels, monitoring and management for hyperglycemia and hyperlipidemia may be required.


Q: Are there specific times of day Temsirolimus should be taken?

A: Temsirolimus is administered as a once-weekly intravenous infusion in a healthcare setting. The specific time of day for the infusion is generally determined by the medical facility's schedule and is not strictly specified in the drug's official administration instructions.


Q: Who is responsible for mixing or preparing the Temsirolimus infusion?

A: Temsirolimus is a cytotoxic drug that requires a complex, two-step dilution process and specific handling to ensure safety and stability. This preparation is strictly the responsibility of a qualified healthcare professional, such as a pharmacist or trained nurse, in a clinical setting.


Q: Can Temsirolimus treatment be paused or stopped if side effects are too severe?

A: Yes, treatment plans allow for flexibility based on patient tolerance. Official guidelines advise that treatment should be held (paused) or the dose may be reduced if severe side effects (Grade 3 or greater) or concerning changes in blood counts are observed. Treatment is typically continued until unacceptable toxicity is reached.


Q: What's the difference between Temsirolimus and other 'limus' drugs like Sirolimus?

A: Temsirolimus is chemically an ester of sirolimus (rapamycin). Official documents describe Temsirolimus as a prodrug, meaning it is converted inside the body into its active metabolite, which is sirolimus. Both compounds work to inhibit the mTOR pathway.


Q: Does Temsirolimus cause fluid retention or swelling?

A: Yes, edema (swelling caused by fluid retention) is a known and common side effect. It is listed in the official adverse reaction data as a 'very common' effect, meaning it occurred in 10% or more of patients during clinical studies.


Q: Is Temsirolimus safe for women who might be breastfeeding?

A: Official regulatory information advises that nursing is not recommended during the period a woman is receiving Temsirolimus. Furthermore, it is recommended to continue to avoid breastfeeding for a period of three weeks following the final dose of the medication.


Q: Can Temsirolimus cause mouth sores (stomatitis)?

A: Yes, the development of mouth sores (stomatitis or mucositis) is a very common side effect of Temsirolimus therapy. It is listed in the official prescribing information as occurring in 10% or more of patients.

How should Temsirolimus be stored and disposed of?

How to Store and Dispose of Temsirolimus?

Temsirolimus is supplied as a concentrate that requires careful handling and storage to maintain its stability. The intact vials must be stored under refrigeration at a temperature between 2 C and 8 C (36 F and 46 F) and must be protected from light by keeping them in the original outer carton.

After initial dilution with the supplied diluent, the mixture is stable for up to 24 hours. The final diluted solution, which must be prepared using non-PVC administration sets and containers (e.g., glass or polyolefin), is stable for only 6 hours and must be used within that time. Do not shake the prepared solution. As Temsirolimus is a cytotoxic drug, it requires adherence to special handling and disposal procedures for hazardous waste. All unused medicine and waste materials must be disposed of safely according to regulatory guidelines. Keep this medicine out of the sight and reach of children.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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