M-PREDROL
Clinical safety rating: caution
Comprehensive clinical and safety monograph for M-PREDROL (M-PREDROL).
Methylprednisolone is a glucocorticoid receptor agonist. It binds to the glucocorticoid receptor, leading to modulation of gene expression and suppression of pro-inflammatory cytokines, chemokines, and adhesion molecules. It also inhibits phospholipase A2, reducing prostaglandin and leukotriene synthesis.
| Metabolism | Hepatic metabolism primarily via CYP3A4 and CYP3A5 isoenzymes. Methylprednisolone is also metabolized via reduction and conjugation to inactive metabolites. |
| Excretion | Primarily hepatic metabolism; <20% excreted unchanged in urine. Negligible biliary/fecal elimination. |
| Half-life | Terminal elimination half-life: 2–4 hours. Clinical context: shorter than other corticosteroids; requires multiple daily doses for sustained anti-inflammatory effect. |
| Protein binding | Approximately 75% bound to corticosteroid-binding globulin (CBG) and albumin. |
| Volume of Distribution | Vd: 1–1.5 L/kg. Clinical meaning: distributes extensively into tissues; reflects high penetration into cells and sites of inflammation. |
| Bioavailability | Oral: 60–80%; Intramuscular: 70–100%; Intravenous: 100%. |
| Onset of Action | Intravenous: 5–15 minutes; Intramuscular: 1–2 hours; Oral: 2–4 hours. |
| Duration of Action | Duration: 48–72 hours for pituitary-adrenal suppression. Clinical notes: Single dose may suppress cortisol for 24–36 hours; tapering needed to avoid adrenal insufficiency. |
4 to 48 mg/day orally or intramuscularly in divided doses every 12 hours; for acute conditions, up to 120 mg/day intravenously in divided doses every 4-6 hours.
| Dosage form | INJECTABLE |
| Renal impairment | No dose adjustment required for GFR ≥30 mL/min; for GFR <30 mL/min, use 50% of normal dose. |
| Liver impairment | Child-Pugh A: no adjustment; Child-Pugh B: use 75% of normal dose; Child-Pugh C: use 50% of normal dose. |
| Pediatric use | 0.5-2 mg/kg/day orally or intramuscularly in divided doses every 6-12 hours; maximum 60 mg/day. |
| Geriatric use | Start at lowest effective adult dose; monitor for hyperglycemia, osteoporosis, and adrenal suppression. |
| 1st trimester | Consult provider |
| 2nd trimester | Consult provider |
| 3rd trimester | Consult provider |
Clinical note
Comprehensive clinical and safety monograph for M-PREDROL (M-PREDROL).
| Breastfeeding | Enters breast milk (M/P ratio 0.25-0.5). Doses up to 40 mg/day considered compatible with monitoring. High doses may suppress infant growth or cause adrenal suppression. Advise discarding milk 4 hours after dose. |
| Teratogenic Risk | First trimester: Increased risk of cleft palate (7-fold relative risk) and congenital heart defects with systemic doses >10 mg/day. Second/third trimester: Fetal growth restriction, adrenal suppression, oligohydramnios, and premature birth. Chronic use: Neonatal adrenal crisis. |
■ FDA Black Box Warning
None.
| Serious Effects |
["Systemic fungal infections","Hypersensitivity to methylprednisolone or any component of the formulation","Administration of live or live-attenuated vaccines during immunosuppressive doses","Intrathecal route of administration (not approved)","Relative: active tuberculosis, peptic ulcer disease, recent myocardial infarction, congestive heart failure, hypertension, diabetes mellitus, osteoporosis, glaucoma, cataracts, history of psychiatric disorders, and pregnancy (use only if benefit outweighs risk)"]
| Precautions | ["Adrenal suppression: Risk of secondary adrenocortical insufficiency upon withdrawal, especially after prolonged therapy.","Immunosuppression and increased susceptibility to infections.","Masking of signs of infection.","Cushing's syndrome with chronic use.","Osteoporosis, especially with long-term use.","Gastrointestinal perforation or bleeding, particularly in patients with inflammatory bowel disease or diverticulitis.","Exacerbation of pre-existing psychiatric conditions (e.g., euphoria, insomnia, mood swings).","Increased intraocular pressure, glaucoma, and cataracts.","Fluid and electrolyte disturbances (e.g., hypertension, edema, hypokalemia).","Growth suppression in children.","Thrombotic events (uncommon).","Kaposi's sarcoma has been reported in patients on corticosteroid therapy."] |
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| Fetal Monitoring |
| Maternal: Blood pressure, glucose tolerance, bone density, eye exams, growth scans. Fetal: Ultrasound for growth restriction and amniotic fluid index every 4-6 weeks. Neonatal: Assess for adrenal insufficiency and infection. |
| Fertility Effects | May impair ovulation due to hormonal suppression at high doses. Reversible after discontinuation. No known effect on spermatogenesis. |