Short answer: Osphena (ospemifene) is a 60 mg tablet taken once a day with food, approved for painful sex and vaginal dryness from menopause.1 Intrarosa (prasterone, also called DHEA) is a 6.5 mg vaginal insert used once a day at bedtime, approved for painful sex from menopause.2 Osphena has a boxed warning on endometrial cancer and stroke and clot risk; Intrarosa has none. Neither label reports a trial against the other.
| Osphena (ospemifene) | Intrarosa (prasterone) | |
|---|---|---|
| Drug type | Estrogen agonist/antagonist tablet1 | Steroid (DHEA) the body turns into androgens and estrogens2 |
| Approved for | Moderate to severe painful sex and moderate to severe vaginal dryness from menopause1 | Moderate to severe painful sex from menopause2 |
| How taken | One 60 mg tablet by mouth once a day with food1 | One 6.5 mg insert in the vagina once a day at bedtime, with a single-use applicator2 |
| Side effects in label trials | Hot flush 6.5% vs 2.6% on placebo; vaginal discharge 3.8% vs 0.4%1 | Vaginal discharge 5.71% vs 3.66% on placebo2 |
| Boxed warning | Endometrial cancer; stroke and blood clots1 | None2 |
| Not used with | Estrogens or other estrogen agonist/antagonists, fluconazole or rifampin1 | Not studied in women with a history of breast cancer2 |
No. Osphena is a tablet that acts like estrogen in some tissues, including the lining of the uterus, but can act differently in others.1 Intrarosa is prasterone, an inactive steroid that the body converts into androgens and estrogens; its label says how it works for vaginal atrophy is not fully established.2 Neither is an estrogen product in the way Premarin or estradiol are.
Osphena's boxed warning covers endometrial cancer and stroke and blood clot risk, and the label says to stop it, if feasible, at least 4 to 6 weeks before surgery linked to clots.1 Intrarosa has no boxed warning; its warning notes that estrogen is a breakdown product of prasterone and that it has not been studied after breast cancer.2 These numbers come from separate trials with different people, lengths and methods, so they are not a head-to-head comparison.
Which option fits is for your prescriber. More detail: Osphena side effects, Intrarosa side effects, and the Osphena and Intrarosa dosing schedules.