Valstar
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Questions & Answers
Side Effects & Adverse Reactions
Patients should be informed that VALSTAR has been shown to induce complete response in only about 1 in 5 patients with BCG-refractory CIS, and that delaying cystectomy could lead to development of metastatic bladder cancer, which is lethal. The exact risk of developing metastatic bladder cancer from such a delay may be difficult to assess (See CLINICAL TRIALS) but increases the longer cystectomy is delayed in the presence of persisting CIS. If there is not a complete response of CIS to treatment after 3 months or if CIS recurs, cystectomy must be reconsidered.
VALSTAR should not be administered to patients with a perforated bladder or to those in whom the integrity of the bladder mucosa has been compromised (see PRECAUTIONS and CLINICAL PHARMACOLOGY, Pharmacokinetics Figure 2).
In order to avoid possible dangerous systemic exposure to VALSTAR for the patients undergoing transurethral resection of the bladder, the status of the bladder should be evaluated before the intravesical instillation of drug. In case of bladder perforation, the administration of VALSTAR should be delayed until bladder integrity has been restored.
VALSTAR should be administered under the supervision of a physician experienced in the use of intravesical cancer chemotherapeutic agents.
Legal Issues
There is currently no legal information available for this drug.
FDA Safety Alerts
There are currently no FDA safety alerts available for this drug.
Manufacturer Warnings
There is currently no manufacturer warning information available for this drug.
FDA Labeling Changes
There are currently no FDA labeling changes available for this drug.
Uses
VALSTAR is indicated for intravesical therapy of BCG-refractory carcinoma in situ (CIS) of the urinary bladder in patients for whom immediate cystectomy would be associated with unacceptable morbidity or mortality.
History
There is currently no drug history available for this drug.
Other Information
Valrubicin (N-trifluoroacetyladriamycin-14-valerate), a semisynthetic analog of the anthracycline doxorubicin, is a cytotoxic agent with the chemical name, (2S-cis)-2-[1,2,3,4,6,11-hexahydro-2,5,12-trihydroxy-7-methoxy-6,11-dioxo-4-[[2,3,6-trideoxy-3-[(trifluoroacetyl)amino]-α-L-lyxo-hexopyranosyl]oxyl]-2-naphthacenyl]-2-oxoethylpentanoate. Valrubicin is an orange or orange-red powder that is highly lipophilic, soluble in methylene chloride, ethanol, methanol and acetone, and relatively insoluble in water. Its chemical formula is C34H36F3NO13 and its molecular weight is 723.65. The chemical structure is shown in FIGURE 1.
FIGURE 1. Chemical Structure of Valrubicin
VALSTAR® (valrubicin) Sterile Solution for Intravesical Instillation is intended for intravesical administration in the urinary bladder. It is supplied as a nonaqueous solution that should be diluted before intravesical administration. Each vial of VALSTAR contains valrubicin at a concentration of 40 mg/mL in 50% polyoxyl castor oil/50% dehydrated alcohol, USP without preservatives or other additives. The solution is sterile and nonpyrogenic.
Sources
Valstar Manufacturers
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Endo Pharmaceuticals Solutions Inc.
![Valstar (Valrubicin) Solution, Concentrate [Endo Pharmaceuticals Solutions Inc.]](/wp-content/themes/bootstrap/assets/img/loading2.gif)
Valstar | Endo Pharmaceuticals Solutions Inc.
VALSTAR is recommended at a dose of 800 mg administered intravesically once a week for six weeks. Administration should be delayed at least two weeks after transurethral resection and/or fulguration. For each instillation, four 5 mL vials (200 mg valrubicin/5 mL vial) should be allowed to warm slowly to room temperature, but should not be heated. Twenty milliliters of VALSTAR should then be withdrawn from the four vials and diluted with 55 mL 0.9% Sodium Chloride Injection, USP providing 75 mL of a diluted VALSTAR solution. A urethral catheter should then be inserted into the patient''s bladder under aseptic conditions, the bladder drained, and the diluted 75 mL VALSTAR solution instilled slowly via gravity flow over a period of several minutes. The catheter should then be withdrawn. The patient should retain the drug for two hours before voiding. At the end of two hours, all patients should void. (Some patients will be unable to retain the drug for the full two hours.) Patients should be instructed to maintain adequate hydration following treatment.
Patients receiving VALSTAR for refractory carcinoma in situ must be monitored closely for disease recurrence or progression. Recommended evaluations include cystoscopy, biopsy, and urine cytology every 3 months.
Administration Precautions: As recommended with other cytotoxic agents, caution should be exercised in handling and preparing the solution of VALSTAR. Contact toxicity, common and severe with other anthracyclines, is not typical with VALSTAR and, when observed, has been mild. Skin reactions may occur with accidental exposure. The use of goggles, gloves, and protective gowns is recommended during preparation and administration of the drug. Irritation of the eye has also been reported with accidental exposure. If this happens, the eye should be flushed with water immediately and thoroughly. Procedures for proper handling and disposal of anticancer drugs should be used.¹-⁴ Spills should be cleaned up withundiluted chlorine bleach.
VALSTAR sterile solution contains polyoxyl castor oil, which has been known to cause leaching of di(2-ethylhexyl) phthalate (DEHP) a hepatotoxic plasticizer, from polyvinyl chloride (PVC) bags and intravenous tubing. VALSTAR solutions should be prepared and stored in glass, polypropylene, or polyolefin containers and tubing. It is recommended that non-DEHP containing administration sets, such as those that are polyethylene-lined, be used.
Preparation for Administration: VALSTAR Sterile Solution for Intravesical Instillation is a clear red solution. It should be visually inspected for particulate matter and discoloration prior to administration. At temperatures below 4°C, polyoxyl castor oil may begin to form a waxy precipitate. If this happens, the vial should be warmed in the hand until the solution is clear. If particulate matter is still seen, VALSTAR should not be administered.
Stability: Unopened vials of VALSTAR are stable until the date indicated on the package when stored under refrigerated conditions at 2°-8°C (36°-46°F). Vials should not be heated. VALSTAR diluted in 0.9% Sodium Chloride Injection, USP for administration is stable for 12 hours at temperatures up to 25°C (77°F). Since compatibility data are not available, VALSTAR should not be mixed with other drugs.
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