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Toxicity of analgesic ,calcium channel blocker, and digoxin with treatment
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Transcript of Toxicity of analgesic ,calcium channel blocker, and digoxin with treatment
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ANALGESICS TOXICITY AND TREATMENT
Presented By:
Maham Shafiq
M Phil Pharmaceutics
2013-2015
University College of pharmacy
Univeristy of the Punjab,Lahore Pakistan
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CLASSIFICATION OF ANALGESIC DRUGS
Narcotic Analgesics
Non-Narcotic Analgesics
Morphine Paracetamol
Diamorphine (Heroin) Salicylate
Dihydrocodiene, codeineOther anti inflammatory drugs e.g. Ibuprofen
Methadone Mefenamic acid
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ACETAMINOPHEN(PARACETAMOL) TOXICITY
Metabolized by glucuronidation ,sulfation P450 mixed function oxidase system to a highly
toxic reactive intermediate. With acute overdose >150-200mg/kg, or 8-10 g in
an average adult, hepatocellular glutathione is depleted and the reactive intermediate attacks other proteins and causes necrosis.
Hepatotoxicity(long term uses)
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DIAGNOSIS:
The diagnosis after acute overdose is based on measurement of serum acetaminophen level.
Shortly After ingestion Nausea and vomiting
Sever poisoning Hepatic necrosis jaundice,hepatic encephalopathy,renal failure and death
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TREATMENTActivated charcoal
Withing 1 -2 Hour
Antidote
N-acetylcysteine intravenously.
N-acetylcysteine
Loading dose = 140mg/kg orally, Maintance dose=70mg/kg every 4 hrs. Dilute the solution 5% with water juice or soda
If vomiting interfere
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OVERDOSE WITH ASPRIN AND THE SALICYTES:
An intentional overdose with aspirin is the most common cause of salicylate intoxication; overdose may be with methylsalicylate.
Poisoning may also occur as a result of transdermal absorption from skin ointments containing salicylate.
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Gastric lavage Upto 12 hr
Activated charcoal
Mild
Severe (with plasma salicylate concentration above 1000 mg/liter)
50-100 g for every 4 hours until recovery
haemodialysis haemoperfusion.
TREATMENT
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OPIOD ANALGESICS
morphine codeine, oxycodone, fentanyl are popular drugs of abuse and cause of
frequent hospitalization of overdose
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DIAGNOSISMild intoxication euphoria, drowsiness and
constricted pupils.
More severe intoxication hypotension, bradycardia, hypothermia, coma and respiratory arrest
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TREATMENTIn emergency Assist ventilation
Administer activated charcoal.
opioid antagonist/antidote Naloxone
Administer 0.4-2mg IVand repeat as needed to awaken the patient and maintain airway protective reflexes and spontaneous breathing
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CA-ANTAGONISTS TOXICITY AND TREATMENT
Calcium channel blockers are used to decrease Blood pressure in patients with hypertension
verapamil, diltiazem, nifedipine, nicardipine, amlodipine etc.
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DIAGNOSISSigns and symptoms Chest pain, Palpitations,
Flushing, Weakness, Confusion, Seizure, dizziness. Headache. Nausea, Vomiting
Physical examination findings Slow heart rate, Hypotension, Depressed level of consciousness
Abnormal findings on blood tests
Hyperglycemia, Hypokalemia Acidosis
On ECG Bradycardia atrioventricular (AV) block.
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TREATMENTEmergency treatment:
Stabilize patient airway, breathing, and assist ventilation.
Activated charcoal For ingested drugs
Treat bradycardia with atropine 0.5-2mg I/v, isoproterinol2-20mcg/min by I/v infusion, or a transcutaneous or internal cardiac pacemaker.
Sustained release product
Whole bowelirrigation
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ANTIDOTESCalcium Chloride 10% -10ml
Calcium gluconate 10% -20ml
Epinepherine 1-4mcg/min
Insulin 0.5-1 U/kg/IV bolus followed by infusion of 05-1 U/kg/hr
Glucagon 5-10mg/iv
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DIGOXIN TOXICITY AND TREATMENT
Cardiac glycosides are derived from a variety of plants and are widely used to treat heart failure and supraventricular arrhythmias
digoxin, digitoxin are derived from digitalis.
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DIAGNOSIS:
Acute over dosage nausea, vomiting, bradycardia, hyperkalemia and AV block frequently occur
Chronic toxicity Hypokalemic due to concurrent diuretic treatment and more commonly present with ventricular arrhythmias.
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TREATMENTIn emergency administer Activated
charcoal
Increases GI elimination and systemic clearance
Hemodialysis
Magnesium: 2 g IV initially, consider maintenance
treat hyperkalemia, but is not effective for reversal of toxicity because of the extensive tissue distribution of digoxin
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