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Magnesium Sulfate

Class: Electrolyte
Mechanism of action:
Reduces striated muscle contractions and blocks peripheral neuromuscular transmission by reducing ACh release at the myoneural junction, manages seizures in toxemia of pregnancy, induces uterine relaxation, can cause bronchodilation after beta-agonists and anticholinergics have been used
Indications:
Seizures of eclampsia, torsade de pointes, hypomagnesemia, Class IIa agent for v-fib/pulseless v-tach that is refractory to lidocaine
Contraindications:
Heart blocks, myocardial damage.
Adverse reactions:
CNS depression, facial flushing, diaphoresis, depressed reflexes, circulatory collapse, hypotension
Drug Interactions:
May enhance effects of other CNS depressants, serious changes in overall cardiac function may occur with cardiac glycosides.

How Supplied: 10%, 12.5%, 50% solution in 40, 80, 100, and 125mg/mL
Dosage and administration:
 
Duration of action:
Onset: IV/IP: Immediate, IM: 3-4 hrs Peak: N/A Duration: 30mins (IV/IO); 3-4hrs (IM) 
Special Considerations:
Pregnancy safety: Cat-B. Recommended that the drug not be given 2hrs before delivery, if possible. IV calcium chloride or calcium gluconate should be available as a magnesium antagonist if needed. Use with caution in patients with renal failure
Half-life:
Unknown

Meperidine (Demerol)

Class: Opioid analgesic
Mechanism of action:
Synthetic opioid agonist that acts on opioid receptors to produce analgesia, euphoria, respiratory and physical depression; a schedule II drug with potential for physical dependency and abuse
Indications:
Analgesia for moderate to severe pain.
Contraindications:
Hypersensitivity to narcotic agents, diarrhea caused by poisoning, patients taking MAOIs, during labor or delivery of a premature infant, undiagnosed abdominal pain or head injury
Adverse reactions:
Respiratory depression, sedation, apnea, circulatory depression, arrhythmias, shock euphoria, delirium, agitation, hallucinations, visual disturbances, coma, seizures, headache, facial flushing, increased ICP, N/V
Drug Interactions:
DO NOT give concurrently with MAOIs (even with a dose in the last 14 days). Exacerbates CNS depression when given with these meds.

How Supplied: 50/mL in 1-mL prefilled syringes and Tubex
Dosage and administration:
Adult: 50-100mg IM, SC or 25-50mg slowly IV Peds: 1-2mg/kg/dose IV/IO/IM/SC
Duration of action:
Onset: IM:10-45mins; IV: Immediate Peak: 30-60mins Duration: 2-4hrs
Special Considerations:
Pregnancy safety: Cat-C. Use with caution in patients with asthma and COPD. May aggravate seizures in patients with known convulsive disorders. Naloxone should be readily available as antagonist
Half-life:
Adult: 2.5-4h Peds: 23h

Methylprednisolone (Solu-Medrol)

Class: Anti-inflammatory glucocorticoid
Mechanism of action:
Synthetic corticosteroid that suppresses acute and chronic inflammation; potentiates vascular smooth muscle relaxation by beta-adrenergic agonists.
Indications:
Acute spinal cord trauma, anaphylaxis, bronchodilator for unresponsive asthma.
Contraindications:
Premature infants, systemic fungal infections; use with caution in patients with GI Bleeds
Adverse reactions:
Headache, hypertension, sodium and water retention, CHF, hypokalemia, alkalosis, peptic ulcer disease, N/V
Drug Interactions:
Hypoglycemic responses to insulin and hypoglycemic agents may be blunted. Potassium-depleting agents may exacerbate hypokalemic effects

How Supplied: 40, 125, 300, and 1,000mg vials
Dosage and administration:
Adults: Acute spinal cord injury: 30mg/kg IV over 30 mins followed by infusion:5.4mg/kg/h. Asthma/COPD: 1-2mg/kg IV Peds: Spinal trauma: 30mg/kg IV over 30mins; infusion: 5.4mg/kg/h. Asthma: 1-2mg/kg/dose IV
Duration of action:
Onset: 1-2hrs Peak: variable Duration: 8-24hrs
Special Considerations:
Pregnancy safety: not established. Not effective in spinal cord injury greater than 8 hrs. Crosses the placenta and may cause fetal harm
Half-life:
 

Midazolam (Versed)

Class: Short-acting benzodiazepine (benzo's) CNS depressant
Mechanism of action:
Anxiolytic and sedative properties similar to other benzo's, memory impairment.
Indications:
Sedation, Anxiolytic prior to ET or NT intubation; administer for conscious sedation
Contraindications:
Glaucoma, shock, coma, ETOH, overdose, depressed vital signs, concomitant use with other CNS depressants, barbiturates, narcotics
Adverse reactions:
Hiccough, cough, oversedation, N/V, injection site pain, headache, blurred vision, hypotension, respiratory depression, and arrest.
Drug Interactions:
Should no be used with patients who have taken a CNS depressants

How Supplied: 2,5,10mL vials(1mg/mL); 1,2,5, 10mL vials(5mg/mL)
Dosage and administration:
Adult: 2.0-2.5mg slow IV over 2-3mins; may be repeated to total maximum: 0.1mg/kg. Peds: Not recommended
Duration of action:
Onset: 1-3mins, IV and dose dependent Peak: variable Duration: 2-6hrs, dose dependent
Special Considerations:
Pregnancy safety: Cat-D. Give immediately prior to intubation procedure. Requires continuous monitoring of vitals. NEVER give as IV bolus
Half-life:
2.5hrs