Potential Side Effects of Commonly Prescribed Medications
IF YOU SUSPECT YOUR PET IS HAVING ADVERSE SIDE EFFECTS FROM THEIR MEDICATION, PLEASE LET US KNOW! WE HAVE ONLY LISTED THE MOST COMMON SIDE EFFECTS FROM PRESCRIBED DOSES HERE (NOT OVERDOSES). ANY MEDICATION HAS THE POTENTIAL TO CAUSE MORE SERIOUS EFFECTS INCLUDING ALLERGIC REACTIONS OR EVEN DEATH.
Side effects tend to be uncommon and mild. They usually involve GI upset (vomiting, diarrhea, poor appetite). Administering antibiotics with food can help.
Never give more than one NSAID at a time or an NSAID and a corticosteroid at the same time, this can cause bleeding GI ulcers.
Non-Steroidal Anti-Inflammatories NSAIDs:
Meloxicam (Meloxidyl, Ostilox, etc.) – GI distress most common (still rare), kidney toxicity is low, but cats should be given lower dose. Not FDA approved for chronic use in cats but is approved in virtually every other country.
Carprofen (Rimadyl) – GI distress most common (still rare), rarely can cause liver failure- monitor via bloodwork
Prednisone – increased thirst/urination, increased appetite, panting, behavioral changes
Prednisolone – same as prednisone
Temaril-P – same as prednisone, also drowsiness
Tramadol – drowsiness, well-tolerated
Bethanechol – vomiting, diarrhea, drooling, anorexia
Famotidine –GI side effects, headache, dry mouth
Lactulose – flatulence, distended stomach, cramping, diarrhea
Maropitant (Cerenia) –continued vomiting, drooling, diarrhea, anorexia
Metronidazole – Rarely neurologic toxicity (seizures, abnormal behavior)
Sucralfate – extremely safe
Combinations of these drugs need to be carefully chosen by a doctor as some combinations can cause serotonin syndrome.
Acepromazine – hypotension, high heart rate, low heart rate, hypothermia, hyperthermia
Clomipramine – lethargy, anorexia, vomiting, diarrhea, increased liver enzymes, dry mouth, increased heart rate
Fluoxetine – lethargy, seizures, GI effects, anxiety, irritability, insomnia/hyperactivity, panting, aggressive behavior, anorexia (usually transient)
Trazadone – sedation, lethargy, ataxia, abnormal heart rhythm, increased anxiety, aggression
Estriol (Incurin) – anorexia, vomiting, increased thirst
Insulin (any type) – hypoglycemia, hyperglycemia, insulin resistance
Levothyroxine (Thyrovet, Thyro-tabs) – none at correct dose- monitor via bloodwork
Methimazole – vomiting, anorexia, lethargy
Trilostane (Vetoryl) – lethargy, inappetence, vomiting, electrolyte abnormalities, diarrhea, all typically self-limiting
Enalapril – poor appetite, diarrhea, vomiting
Furosemide (Lasix) – electrolyte abnormalities, dehydration
Pimobendan (Vetmedin) – GI side effects, cardiac arrhythmia
Fenbendazole (Panacur) – allergic reactions from dying parasites, drooling, vomiting, diarrhea
Ivermectin – potentially fatal if patient has heartworms, neurotoxicity esp. in animals with MDR1 gene defect
Praziquantel – poor appetite, vomiting, lethargy, diarrhea
Pyrantel (Strongid) – vomiting
Sulfadimethoxine (Albon) – urinary issues, dry eye, bone marrow depression, skin rash, inflamed retina, fever, vomiting, polyarthritis
Apoquel – diarrhea, vomiting, poor appetite, lethargy
Cyclosporine (Atopica) – vomiting, poor appetite, diarrhea
Gabapentin – sedation, ataxia
Leviteracetam – lethargy
Phenobarbital – increased agitation, lethargy, increased thirst, increased appetite, ataxia, increased liver enzymes, rarely anemia, low platelets, low white blood cells
Potassium Bromide – lethargy, increased appetite, increased thirst
Zonisamide – sedation, ataxia, inappetence
Albuterol – increased heart rate, tremors, nervousness, dizziness (all typically transient)
Azathioprine – bone marrow suppression, GI upset, anorexia, poor hair growth, acute pancreatitis, liver toxicity
Hydroxyzine – sedation, rarely tremors, seizures, depression, behavioral changes
Ketoconazole/Fluconazole/Itraconazole – inappetence, rarely increased liver enzymes, liver toxicity
Meclizine/Mirataz – sedation, dry mouth, dry eyes, increased heart rate
Methocarbamol – sedation, salivation, vomiting, lethargy, weakness, ataxia
Proin – restlessness, irritability, hypertension, anorexia
Terbinafine – vomiting
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