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The systems of the body most affected by chemotherapy drugs include visual and semantic memory, attention and motor coordination and executive functioning. [9] [10] These effects can impair a chemotherapy patient's ability to understand and make decisions regarding treatment, perform in school or employment and can reduce quality of life. [10]
Other side effects include low white blood cell count, vomiting, loss of appetite, diarrhea, or fatigue. These can typically be controlled well, and most cats have a good quality of life during treatment. If a cat relapses after attaining remission, the cat can be treated with different chemotherapy drugs to try for a second remission.
Aside from these blisters, the dog may be mostly asymptomatic before the disease progresses further. [4] The blisters are easily ruptured and become painful upon doing so, [4] which can cause the dog to have difficulty eating. [15] As the disease progresses, the infected dog can become severely infirm, and may succumb to further infection. [4]
The main treatment for acral erythema is discontinuation of the offending drug, and symptomatic treatment to provide analgesia, lessen edema, and prevent superinfection. However, the treatment for the underlying cancer of the patient must not be neglected. Often, the discontinued drug can be substituted with another cancer drug or cancer treatment.
Cyclophosphamide is a pregnancy category D drug and causes birth defects. First trimester exposure to cyclophosphamide for the treatment of cancer or lupus displays a pattern of anomalies labeled "cyclophosphamide embryopathy", including growth restriction, ear and facial abnormalities, absence of digits and hypoplastic limbs. [17]
Lomustine may be administered orally or by injection in cats and dogs. This chemotherapy has been observed to have a variety of side effects in animals, paralleling those in humans, including but not limited to bone marrow immunosuppression, gastrointestinal issues, and hepatotoxicity. [12]
As most chemotherapy drugs kill cancer cells in this manner, defective apoptosis allows survival of these cells, making them resistant. Many chemotherapy drugs also cause DNA damage, which can be repaired by enzymes in the cell that carry out DNA repair. Upregulation of these genes can overcome the DNA damage and prevent the induction of apoptosis.
Side effects in dogs and cats include hypersalivation, diarrhea, loss of appetite, and vomiting. [12] [16] Eight percent of dogs taking maropitant at doses meant to prevent motion sickness vomited right after, likely due to the local effects maropitant had on the gastrointestinal tract. Small amounts of food beforehand can prevent such post ...