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|Pyridostigmine Bromide |
Drugs search, click the first letter of a drug name: | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | 1 | 2 | 3 | 4 | 5 | 6 | 8 | 9 Home Pyridostigmine BromidePronouncation: (pihr-id-oh-STIG-meen BROE-mide)Class: Anticholinesterase muscle stimulant Trade Names: Mechanism of ActionPharmacologyFacilitates myoneural junction impulse transmission by inhibiting acetylcholine destruction by cholinesterase. PharmacokineticsEliminationPrimarily excreted unchanged by the kidney. Indications and UsageTreatment of myasthenia gravis; reversal agent or antagonist to nondepolarizing muscle relaxants such as curariform drugs and gallamine triethiodide (IV only). ContraindicationsMechanical intestinal or urinary obstruction; hypersensitivity to anticholinesterase agents. Dosage and AdministrationAdultsPO Individualize dosage to meet the needs of the patients. Syrup/Conventional tabletAverage dose is ten 5 mL tsp (60 mg/5 mL) daily or ten 60 mg tablets spaced to provide max relief when max strength is needed (range is usually 1 to 25 tablets or tsp/day). Extended-release tabletsOne to three 180 mg tablets, qd or bid with at least 6 hr between doses. IV To supplement oral dosage preoperatively and postoperatively during labor and postpartum, during myasthenic crisis, or when oral therapy is impractical, give approximately 1/30 the oral dose, either IM or very slow IV. NeonatesIV Neonates of myasthenic mothers may have transient difficulty in swallowing, sucking, and breathing. Injectable pyridostigmine may be indicated (by symptoms and use of the edrophonium test) until syrup can be taken. Dosage requirements range from 0.05 to 0.15 mg/kg IM. Reversal of Nondepolarizing Muscle RelaxantsInjection Give atropine sulfate (0.6 to 1.2 mg) IV immediately prior to pyridostigmine to minimize side effects. Pyridostigmine 10 or 20 mg IV is usually sufficient. Full recovery usually occurs in no more than 15 min but at least 30 min may be required. General Advice
Drug InteractionsAtropineMay mask signs of overdosage, leading to inadvertent induction of cholinergic crisis. CorticosteroidsThe therapeutic effects of pyridostigmine may be antagonized. SuccinylcholineNeuromuscular blockade produced by succinylcholine may be prolonged or antagonized. Laboratory Test InteractionsNone well documented. Adverse ReactionsDermatologicSkin rash. EENTMiosis. GINausea; vomiting; diarrhea; abdominal cramps; increased peristalsis; increased salivation. MusculoskeletalMuscle cramps and fasciculation; weakness. RespiratoryIncreased bronchial secretions. MiscellaneousIncreased sweating. PrecautionsPregnancyCategory C . LactationExcreted in breast milk. Renal FunctionLower doses may be required in patients with renal disease. Bronchial asthmaUse with caution. Cardiac dysrhythmias (IV only)Use with caution. Transient bradycardia may occur and be relieved by atropine sulfate. Cholinergic crisisObserve patients closely for cholinergic reactions, particularly if the IV route is used. May be difficult to distinguish from myasthenic crisis. Differentiation is important because increasing the dose of pyridostigmine or other drugs of this class may have grave consequences in patients in cholinergic crisis. OverdosageSymptomsCholinergic crisis, characterized by increasing muscle weakness (including respiratory paralysis and death). Patient Information
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