FDA approved indications:
Non-FDA approved indications:
Paclitaxel is an antimicrotubule agent. It promotes the assembly of microtubules by enhancing the action of tubulin dimers and stabilizing current microtubules while inhibiting their disassembly. Due to the stability of the microtubules, late G2 phase stops and cell replication inhibited. Paclitaxel may also distort mitotic spindles causing the chromosomes to break.
Paclitaxel is available as an IV formula that is infused over 3 or 24 hours depending on the indication or protocol. Certain off-label protocols use a 1-hour infusion, as well as off-label intraperitoneal use. Paclitaxel infusion should be through a 0.22-micron in-line filter and polyethylene-lined administration set (non-PVC). If the drug is part of a combination chemotherapy regimen, the order may vary by regimen, and it is important to refer to a protocol for the recommended sequence. Patients may also be premedicated with dexamethasone, diphenhydramine, cimetidine, or ranitidine prior to the infusion. Because paclitaxel is such a potent irritant, care to avoid extravasation must be taken. Caution with needle and catheter position is essential during the administration of the medication.
Paclitaxel has a black box warning for hypersensitivity reactions and bone marrow suppression. Patients should be premedicated with corticosteroids, diphenhydramine, and H2 antagonists prior to infusion to avoid anaphylaxis and severe hypersensitivity reactions. The recommendation is for dexamethasone at 20 mg IV or orally (10 mg if the patient has advanced HIV) at 12 and 6 hours before the paclitaxel dose. Diphenhydramine should be administered 30 to 60 minutes prior to the dose at 50 mg IV. Cimetidine 300 mg, famotidine 20 mg, or ranitidine 50 mg would all be appropriate choices to be administered IV at 30 to 60 minutes prior to the dose. Severe hypersensitivity reactions would include dyspnea requiring bronchodilators, hypotension requiring treatment, angioedema, and/or generalized urticaria. In cases of serious hypersensitivity reaction, stop the infusion and discontinue paclitaxel. Minor hypersensitivity reactions do not require treatment to be interrupted or discontinued. Minor hypersensitivity reactions would include flushing, dyspnea, hypotension, skin reactions, or tachycardia.
The most prevalent side effects of paclitaxel are alopecia, nausea and vomiting, mucositis, neutropenia, leukopenia, anemia, hypersensitivity reactions, arthralgia, myalgia, and weakness. Peripheral neuropathy is another common side effect and patients with preexisting neuropathies may have an increased risk. The dose should be reduced by 20% for patients who develop severe neuropathy.
Other less common side effects include flushing, edema, hypotension, skin rash, stomatitis, thrombocytopenia, hemorrhage, increased serum alkaline phosphatase and AST, local injection site reaction, increased serum creatinine, along with many more. Injection site reactions generally are mild (erythema, tenderness, skin discoloration, or swelling) and tend to occur more often with an extended infusion duration, like 24 hours for example. It is worth noting that delays of injection site reactions can extend from 7 to 10 days. Patients may also experience infusion-related hypotension, bradycardia, and/or hypertension. Due to that concern, the recommendation is that the patient's vital signs undergo frequent monitoring, especially during the first hour of infusion.
Due to the black box warning for hypersensitivity reactions and bone marrow suppression, paclitaxel should not be given to patients who have had a severe hypersensitivity reaction with paclitaxel, patients with solid tumors who have a baseline neutrophil count of less than 1500 cells/mm^3, or patients with AIDS-related Kaposi sarcoma if the baseline neutrophil count is less than 1000 cells/mm^3. Bone marrow suppression is dose dependent and is a dose-limiting toxicity. If it occurs, future doses should be reduced by 20% for severe neutropenia and consider supportive therapy (growth factor treatment).
The infusion site should be monitored for extravasation. If it occurs, stop the infusion immediately and disconnect, but leave the needle/cannula in place. The extravasated solution should be gently aspirated, but it is crucial not to flush the line. Remove the needle/cannula, initiate the antidote, remove that needle/cannula, and elevate the extremity. The data conflicts over whether to use warm or cold compresses. Patients should also be monitored for a severe hypersensitivity reaction. Although every patient should be premedicated to prevent one from happening, some patients may still experience one which would warrant treatment discontinuation.
Hyaluronidase is the antidote for paclitaxel and is commonly used for the treatment of extravasation. If the needle/cannula is still in place, administer 1 to 6 mL into the existing IV line. If the needle/cannula is no longer inserted, the hyaluronidase may be injected subcutaneously clockwise around the area of extravasation. This procedure may be repeated several times over the next 3 to 4 hours.
Successful interprofessional teamwork and communication assure that all patients receive their appropriate dose and regimen based on FDA guidelines or hospital protocol. Oncologists should thoroughly evaluate the patient and select an appropriate treatment regimen based on guidelines and patient-specific factors. Nurses should be made aware of the signs and symptoms of hypersensitivity reactions to paclitaxel along with extravasation management. Pharmacists should examine the patient’s current and complete drug regimen and make sure there are no interactions, as paclitaxel has many that could make treatment modifications necessary. These are just a few examples of healthcare professionals that may have responsibilities for patients taking paclitaxel. Naturally, roles tend to overlap in various health professions, but every healthcare professional provides a vital role that benefits the patient to the highest degree. (Level V)
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