Note: This document contains side effect information about ospemifene. Some of the dosage forms listed on this page may not apply to the brand name Osphena.
More frequent side effects include: endometrial hyperplasia and hot flash. See below for a comprehensive list of adverse effects.
Applies to ospemifene: oral tablet
Oral route (Tablet)
Ospemifene is an estrogen agonist/antagonist that has tissue selective effects and estrogen agonistic effects in the endometrium. Risk of endometrial cancer is increased in women with a uterus who use unopposed estrogens. Risk of endometrial hyperplasia is reduced with the addition of a progestin to estrogen therapy. Therapy with estrogen-alone increases the risk of stroke and DVT. DVT and cerebral thromboembolic and hemorrhagic stroke have been reported with ospemifene use.
Along with its needed effects, ospemifene (the active ingredient contained in Osphena) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur while taking ospemifene:
Some side effects of ospemifene may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
Applies to ospemifene: oral tablet
The more commonly reported adverse events have included hot flush, vaginal discharge, muscle spasms, genital discharge, and hyperhidrosis.
In the clinical trials, the incidence rates of thromboembolic and hemorrhagic stroke in women receiving this drug were 1.13 and 3.39 per thousand women years, compared with 3.15 and 0 per thousand women years in placebo. Two cases of myocardial infarction occurred in women receiving this drug and 2 cases of deep vein thrombosis.
This drug has been reported to initiate or increase the occurrence of hot flashes in some women. In phase 2/3 clinical trials, about 1% of women discontinue this drug due to hot flushes.
Common (1% to 10%): Hot flashes
Uncommon (0.1% to 1%): Hemorrhagic stroke, deep vein thrombosis (DVT)
Rare (less than 0.1%): Thromboembolic stroke, myocardial infarction
Postmarketing reports: Thrombosis, pulmonary embolism
Postmarketing reports: Pulmonary embolism
Postmarketing reports: Endometrial hyperplasia, endometrial cancer
During clinical trials, one case of simple hyperplasia without atypia occurred. Endometrial thickening of 5 mm or greater was observed in women taking 60 mg/day at a rate of 60.1 per thousand compared to 21.2 per thousand in the placebo group. Any type of proliferative (weakly plus active plus disordered) endometrium was reported at 86.1 per thousand in women taking this drug compared with 13.3 per thousand for placebo. Uterine polyps occurred at an incidence of 5.9 per thousand compared with 1.8 per thousand in those receiving this drug and placebo, respectively. Endometrial cancer was not reported in trials up to 52 weeks long.
Common (1% to 10%): Vaginal discharge, genital discharge, proliferative endometrium, endometrial thickening
Uncommon (0.1% to 1%): Uterine polyps
Rare (less than 0.1%): Simple hyperplasia without atypia
Common (1% to 10%): Hyperhidrosis
Postmarketing reports: Rash, rash erythematous, rash generalized, pruritus, urticaria
Common (1% to 10%): Muscle spasms
Postmarketing reports: Allergic conditions including hypersensitivity, angioedema
Postmarketing reports: Headache
Medically reviewed by BestRx Medical Team Last updated on 1/1/2020.
Source: Drugs.com Osphena