pharm final Flashcards
(90 cards)
Alopecia
Hair cells divide rapidly; common effect. Effects self esteem.
Emetic potential
May require pre-medication with anti emetic
Small frequent bland meals; nutritional supplementation
(Reglan, ondansetron, Thorazine)
Myelosuppression
Neutropenia may be a dose limiting factor (monitor CBC)
Withhold drug until blood counts normalize
Nadir
Lowest white blood cell count related to dosing
Extravasation
Drugs leak into surrounding tissue
Stop infusion, leave catheter in place (might be needed to administer antidote
methotrexate (MTX)
Folic acid antagonist, also used for rheumatoid arthritis Interferes with folic acid, which is used in DNA synthesis so the cells die
NO NSAIDs. Neutropenic precautions. Assess for bleeding and bruising. Hydrate, no spice, no acid, soft food.
High doses associated with severe bone marrow suppression
Purine antagonists
fludarabine (F-AMP)
mercaptopurine (6-MP)
allopurionol, others.
Results in interruption in between DNA and RNA synthesis and induces cell lysing
fluorouracil (5-FU)
typically used for breast, esophageal and stomach cancer
Pyrimidine antagonist
Pyrimidine antagonists
fluorouracil (5-FU)
cytarabine (ARA-C), others
Interrupts DNA and RNA synthesis
Antimetabolites: Indications
In combination with other drugs to treat various types of cancer, such as solid tumors and some hematologic cancers
Leukemias (acute & chronic)
Colon, rectal, breast, stomach, lung, pancreatic cancers
Antimetabolites: Adverse Effects
Alopecia, N & V, myelosuppression common
Antimetabolites Reacts With
Ibuprofen (NSAIDS) including ASA (aspirin) are contraindicated with methotrexate; ↑toxicity
leucovorin rescue
for severe bone marrow suppression
administered with high dose methotrexate
Gives ↑antitumor action with ↓ toxicity – can be used to kill the maximum amount of cells without killing the patient.
methotrexate special considerations
neutropenia (precautions, low microbe diet, NO nsaids)
pancytopenia - assess for bleeding and bruising (soft bristle toothbrush, electric shaver)
mucositis - soft diet, non-spicy, non-acidic and hydrate
Vinca alkaloids (vincristine)
IV ONLY - NEVER IN A CATHETER
Mitotic Inhibitors
Natural products obtained from the periwinkle plant, European and western yew trees
potentially neurotoxic: Peripheral neuropathy, parethesias, foot drop
Used as a part of a cocktail – combo with other drugs
cause hairloss, approved for leukemia
vincristine has excavated, what do you do
Stop infusion, leave catheter in place (might be needed to administer antidote
Several specific antidotes can be used
For vincristine mix hyaluronidase 150u/ml + 1 mL Nacl
Inject into extravasated site with multiple SQ injections
Repeat in several hours
Warm compress
Alkylating Drugs: Adverse Effects
Nausea and vomiting, myelosuppresion (can be dose-limiting)
Alopecia
Nephrotoxicity (can be prevented with hydration), peripheral neuropathy, ototoxicity
Extravasation causes tissue damage and necrosis
Alkylating Drugs: how to reduce nephrotoxicity?
hydration
cisplatin (Platinol-AQ)
Alkylating Drugs
especially nephrotoxic- don’t give with other nephrotoxic drugs
hydration can prevent nephrotoxicity – pre hydrate
Alkylating Drugs: Examples
cisplatin (Platinol-AQ)*
mechlorethamine (Mustargen)*
cyclophosphamide (Cytoxan)*
altretamine (Hexalen)
carmustine (BiCNU)
temozolomide (Temodar)
thiotepa (Thioplex)
Cytotoxic Antibiotics
while they’re antibiotics, they’re too toxic for normal infections. They’re for cancer treatment
Cytotoxic Antibiotics Side Effects
Hair loss, N&V, myelosuppression common
bone marrow suppression except (bleomycin)
Cytotoxic Antibodies Special Consideration
“Rubacins”-many look alike-sound alikes but dosing/protocols differ widely!
Doxorubicin (adriamycin)
Cytotoxic Antibiotic
for breast, bone, ovarian, leukemias, Kaposi sarcoma
!! Cardiotoxic !!
heart failure, cardiomyopathy, decreased CO
Need for routine heart scan for early detection with these agents!
Cumulative dose limitations
Cytoprotective drugs (dexrazoxane) to ↓ incidence