Spironolactone vs Aygestin: side-by-side comparison
Spironolactone (Diuretics) and Aygestin (Women's Sexual Health) belong to different therapeutic classes and are rarely interchangeable. This page compares the medications' purposes, mechanisms and the situations where each is used.
| Property | Spironolactone | Aygestin |
|---|---|---|
| Active ingredient | Spironolactone | Norethindrone |
| Manufacturer | Various generics | Various generics |
| Class | Diuretics | Women's Sexual Health |
| Strengths | 25mg, 50mg, 100mg | 5mg |
| Forms | tablet | tablet |
What's the same
Spironolactone and Aygestin are used in very different patients, and the points in common are limited. The main shared element is that both meet regulatory standards for efficacy and safety and benefit from pharmacist oversight.
Key differences
Spironolactone belongs to Diuretics while Aygestin belongs to Women's Sexual Health. Indications, mechanisms and target populations differ. The comparison is most useful when a clinician has mentioned both medications and the patient wants to understand where each fits.
Mechanism and action
Spironolactone: Spironolactone competitively blocks the aldosterone (mineralocorticoid) receptor in the distal tubule, reducing sodium reabsorption and potassium excretion. Aygestin: Norethindrone binds to progesterone receptors and exerts progestational effects: thickening cervical mucus, suppressing the LH surge, thinning the endometrium and reducing endometrial implant activity in endometriosis.
When Spironolactone is preferred
Spironolactone is approved for heart failure with reduced ejection fraction, primary hyperaldosteronism, resistant hypertension, oedema in cirrhosis or nephrotic syndrome, and certain potassium-loss states.
When Aygestin is preferred
Aygestin is approved for endometriosis-associated pain, abnormal uterine bleeding due to hormonal imbalance, and secondary amenorrhoea.
Frequently asked questions
Is Spironolactone or Aygestin better? ▾
Spironolactone and Aygestin are not interchangeable — they treat different conditions. Asking which is "better" is meaningful only when a clinician has weighed both for the same specific clinical scenario.
Can I switch from Spironolactone to Aygestin? ▾
Switching between Spironolactone and Aygestin is rarely an appropriate decision since they belong to different classes and treat different conditions. The real question is usually whether the diagnosis calls for one medication or the other — which the prescriber resolves.
Do Spironolactone and Aygestin have the same side effects? ▾
No — they belong to different classes and have distinct side-effect profiles. Each medication has its own prescribing information.
More Spironolactone comparisons
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.