Estradiol Transdermal Patch and Prednisolone: Interaction Details
AI-assisted, pharmacist-reviewed · Source data updated Aug 8, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Estradiol Transdermal Patch
Prednisolone
How we grade severity & evidence
Severity levels
- Contraindicated: These should generally not be used together.
- Major: Potentially serious — often needs a change or close monitoring.
- Moderate: Can be significant — usually manageable with monitoring.
- Minor: Usually limited clinical impact.
Evidence grades
- Established: Well documented — supported by controlled studies or strong clinical data.
- Probable: Good supporting evidence, though not definitively proven.
- Suspected: Some evidence suggests this interaction, but it is not well established.
- Possible: Limited or conflicting evidence; the interaction may occur.
- Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.
Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.
What happens
Increased prednisoLONE exposure and an increased risk of corticosteroid side effects (neuropsychiatric reactions, fluid and electrolyte disturbances, hypertension, hyperglycemia)
Interaction Deep Dive
COCs containing ethinyl estradiol may inhibit the metabolism of prednisoLONE and may increase the plasma concentrations of prednisoLONE1. Combination contraceptives may decrease prednisoLONE clearance significantly 2567.
Why it happens (mechanism)
Inhibition of prednisoLONE metabolism
Literature reports
2 reports — tap to read
a) Chronic contraceptive and steroid use results in a marked decrease in prednisoLONE clearance. Six females using chronic oral contraceptives received prednisoLONE 0.53 (high dose) and 0.14 mg/kg (low dose) intravenously. Six females (controls) received only prednisoLONE. A significant decrease in clearance occurred for each of the prednisoLONE doses in women receiving oral contraceptives as compared with the control values (p less than 0.01). There is a significant decrease in unbound prednisoLONE clearance for women taking oral contraceptives compared with 0 control subjects at both doses (p less than 0.01). The results presented in this study demonstrate that an approximate 3.5-fold increase in prednisoLONE dose resulted in an increase, observed in each subject, in clearance by a factor of 1.96 +/- 0.52 for the control subjects and by a factor of 1.44 +/- 0.33 for the oral contraceptives group. Dose-dependent prednisoLONE kinetics and marked decreases in prednisoLONE clearance in women taking oral contraceptives results from concomitant synthetic estrogen dosing. Women taking oral contraceptives who are currently undergoing prednisoLONE therapy should be monitored carefully. The author expects lower doses of prednisoLONE to yield clinical efficacy in these patients 3.
b) The clearance of free prednisoLONE is reduced in women taking oral contraceptives compared to women who do not. The study evaluated eight female subjects who used oral combination contraceptives and eight female control subjects who did not. Each subject received prednisoLONE phosphate equivalent to 0.1 mg/kg intravenous of prednisoLONE and 1.0 mg/kg of prednisoLONE. Free prednisoLONE clearance was reduced approximately 30% in oral contraceptive users compared with control subjects (p less than 0.001). Pre-dose plasma cortisol concentrations were elevated two-fold (p less than 0.001) in oral contraceptive users compared with control subjects. The authors conclude that inhibition of prednisoLONE clearance by cortisol may be the mechanism for circadian variations in free prednisoLONE clearance. This mechanism could contribute the inhibition of prednisoLONE clearance by oral contraceptives. This study demonstrated that there is a reduction in the dose dependency of free prednisoLONE clearance in oral contraceptive users compared to control subjects 4.
Common questions
Can I take Estradiol Transdermal Patch and Prednisolone together?
Increased prednisoLONE exposure and an increased risk of corticosteroid side effects (neuropsychiatric reactions, fluid and electrolyte disturbances, hypertension, hyperglycemia) Always confirm with your pharmacist or prescriber before making any change.
How serious is the Estradiol Transdermal Patch and Prednisolone interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "delayed". Effects tend to build up gradually over days to weeks.
How strong is the evidence for this interaction?
The evidence is graded "established". Well documented — supported by controlled studies or strong clinical data.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Estradiol Transdermal Patch or Prednisolone need adjusting while I take them together?
- What symptoms should prompt me to call you or my prescriber right away?
- Does the timing of my doses matter for this combination?
- Is there a safer alternative to one of these medications for me?
References (7)
- Product Information: LOESTRIN(R) 24 Fe oral tablets, norethindrone acetate ethinyl estradiol oral tablets, ferrous fumarate oral tablets. Teva Pharmaceuticals USA Inc (per FDA), Parsippany, NJ, 2023. DailyMed
- Shenfield GM & Griffin JM: Clinical pharmacokinetics of contraceptive steroids: an update. Clin Pharmacokinet 1991; 20:15-37. PubMed
- Legler U & Benet L: Marked alterations in dose-dependent prednisolone kinetics in women taking oral contraceptives. Clin Pharmacol Ther 1986; 39:425-9. PubMed
- Meffin P, Wing L, Sallustio B, et al: Alterations in prednisolone disposition as a result of oral contraceptive use and dose. Br J Clin Pharmacol 1984; 17:655-664. DOI
- Legler & Benet: Marked alterations in dose-dependent prednisolone kinetics in women taking oral contraceptives. Clin Pharmacol Ther 1986; 39:425-429. DOI
- Frey BM & Frey FJ: The effect of altered prednisolone kinetics in patients with the nephrotic syndrome and in women taking oral contraceptive steroids on human mixed lymphocyte cultures. J Clin Endocrinol Metab 1985; 60:361-369. PubMed
- Kozower M, Veatch L, & Kaplan MM: Decreased clearance of prednisolone, a factor in the development of corticosteroid side effects. J Clin Endocrinol Metab 1974; 38:407-412. DOI
Keep reading about Estradiol Transdermal Patch
Keep reading about Prednisolone
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