Oral cancer therapy encompasses cytotoxic chemotherapy, targeted therapies and includes agents such as anagrelide, hydroxyurea and all-trans-retinoic-acid (ATRA). An increasing number of oral therapies have become available for cancer treatment in recent years particularly with regards to molecular targeted therapy. Although targeted therapies do not damage normal cells in the way cytotoxic chemotherapy does, they are still associated with toxic adverse effects and subject to risk of errors in prescribing, supply and administration.
Oral cancer medications should be subject to the same rigorous safety control and procedures as cancer medications administered by other routes.
Errors that occur with oral cancer therapies frequently mirror those that occur with parenteral cancer therapies such as calculation errors, scheduling errors or omission of supportive therapies. The self-administration of oral cancer therapies also introduces additional risks such as misunderstanding of complex dosing regimens with consequential mis-dosing and non-adherence.
Errors and subsequent harm have occurred where patients have misinterpreted dosage instructions and where greater then needed quantities have been dispensed which enables patients to continue dosing beyond that clinically indicated.
The pharmacist has an important role in ensuring safe provision of therapy and provision of patient education to permit safe self-administration in the home. The role of the pharmacist in ensuring the safe provision of oral cancer therapy includes (but is not limited to) the clinical verification of prescriptions, dispensing of cancer therapy medications including supportive therapy (e.g. antiemetics, anti-diarrhoeals) and the provision of information and education to patients.
Prescriptions for oral cancer medications must be clinically verified by a pharmacist with appropriate training and skills in cancer pharmacy prior to being dispensed (Society of Hospital Pharmacists of Australia Committee of Specialty Practice in Cancer Services, 2007; Carrington et al, 2010; Rudnitzki and McMahon, 2015; British Oncology Pharmacy Association, 2013).
Prescriptions for oral cancer therapies should be verified using the same procedures and safety standards as those used to verify cancer therapy administered via other routes. In addition, the following should be verified:
For oral cancer therapies administered for a finite course or stated duration, the quantity supplied should only be the quantity of tablets/capsules the patient requires for that cycle of treatment (Society of Hospital Pharmacists of Australia Committee of Specialty Practice in Cancer Services, 2007; Carrington et al, 2010). This type of intermittent scheduling is common with the traditional cytotoxic oral agents such as capecitabine, cyclophosphamide, melphalan, methotrexate etc.
This quantity may be less than the allowed PBS prescribed quantity however the use of PBS quantities as whole patient packs may pose a risk to patients if they contain more tablets than are needed for the cycle. If the amount supplied overrides the prescribed PBS quantity, then this should be documented and endorsed on the prescription/order.
For non-cyclical continuous cancer therapy, usually molecular targeted therapy, the exact quantity of oral cancer agent(s) required for that cycle of therapy should be supplied or until the next review is due. It is usual practice to provide one month’s supply per dispensing and for the patient to be reviewed monthly (or more frequently) until they are established on the therapy (Institute for Safe Medication Practices, 2014; Phillips, 2003; NHS National Patient Safety Agency UK, 2008).
Oral cancer medications are often classified as cytotoxic or hazardous agents. Pharmacists should refer to state and national guidelines and legislation for guidance on the safe handling of cytotoxic and hazardous agents. Oral cancer therapies should be stored in designated areas in a dispensary and be clearly labelled. Where more than one strength is available (e.g. capecitabine 150mg & 500mg or temozolomide with strengths ranging from 5mg to 180mg capsules), steps should be in place to adequately separate stock to minimise the risk of stock being incorrectly picked from the shelf.
Pharmacists have a professional responsibility to provide patients with adequate written and verbal education to use medications safely and effectively (Pharmacy Board of Australia, 2015). The Patient Information section of these guidelines includes the requirements for patient education and provision of information regarding cancer therapy including chemotherapy, targeted therapy and supportive therapies and additional education requirements for oral cancer therapies.
(Society of Hospital Pharmacists of Australia Committee of Specialty Practice in Cancer Services, 2007) ;(Carrington et al, 2010) ;(Rudnitzki and McMahon, 2015) ;(British Oncology Pharmacy Association, 2013) ;(Society of Hospital Pharmacists of Australia Committee of Specialty Practice in Cancer Services, 2007) ;(Institute for Safe Medication Practices, 2014) ;(Phillips, 2003) ;(NHS National Patient Safety Agency UK, 2008) ;(Pharmacy Board of Australia, 2015)
Staff dispensing oral cancer medicines in the community setting or community pharmacies must have appropriate skills and training to verify oral cancer therapy. They must have access to all relevant treatment information and patient parameters to ensure they can confirm that the prescribed treatments and dose are appropriate for the patient. Access to a cancer pharmacist at the hospital/institute where the therapy has been initiated is important to clarify treatment related questions. The eviQ Cancer Education Online module “Cancer Medicines - the role that community pharmacists play in supporting their customers” provides practical learning activities addressing issues encountered in the community pharmacy setting (Cancer Institute NSW, 2017).
Dispensing chemotherapy from repeat prescriptions should be discouraged as changes can often occur to prescriptions due to clinical reasons. Where this is unavoidable, repeat prescriptions for subsequent cycles of oral cancer medicines should be confirmed with the prescriber before dispensing to ensure there has been no change to dose or treatment since the initial prescription was written. A chemotherapy order should also accompany the script. Where a change has been made, a new prescription should be requested and the old prescription/repeats destroyed (Society of Hospital Pharmacists of Australia Committee of Specialty Practice in Cancer Services, 2007).
Further discussions with clinicians and patients may be needed if a patient returns unused quantities of oral cancer medication with no clinical rationale or a patient runs out of supply before expected according to the dose prescribed. This may indicate over compliance, mis-dosing or non-adherence (Taylor et al, 2006; Spoelstra and Given, 2011; Spoelstra et al, 2013).
Child-proof caps must be used when dispensing non-blister packs or containers of oral chemotherapy (Society of Hospital Pharmacists of Australia Committee of Specialty Practice in Cancer Services, 2007).
Barcode scanning of product and computer generated labels should be used when dispensing oral chemotherapy (Weingart et al, 2011; Pharmacy Board of Australia, 2015).
Oral cancer agents should not be made available as imprest or ward stock (Society of Hospital Pharmacists of Australia Committee of Specialty Practice in Cancer Services, 2007).
(Cancer Institute NSW, 2017) ;(Society of Hospital Pharmacists of Australia Committee of Specialty Practice in Cancer Services, 2007) ;(Taylor et al, 2006) ;(Spoelstra and Given, 2011) ;(Spoelstra et al, 2013) ;(Society of Hospital Pharmacists of Australia Committee of Specialty Practice in Cancer Services, 2007) ;(Weingart et al, 2011) ;(Pharmacy Board of Australia, 2015)
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