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Side Effects



Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. The adverse reaction information from clinical trials does, however, provide a basis for identifying the adverse events that appear to be related to drug use and for approximating rates.

Table 4 summarizes the treatment-emergent adverse events with Estrasorb therapy.

Table 4: Number (%) of Patients Reporting ≥ 5% Treatment-Emergent Adverse Events

Body system/Preferred term Statistic Treatment group
(n= 134)
Estrasorb 3.45 grams
(n = 139)
Number of subjects with ≥ 1 TEAE n(%) 82(61] 95 (68)
Body as a whole n (%) 40 (30) 49 (35)
  Headache n (%) 17(13) 12(9)
  Infection n (%) 10(7) 16(12)
Respiratory n(%) 15(11) 19(14)
  Sinusitis n(%) 6(4) 9(6)
Skin and appendages n (%) 7(5) 15(11)
  Pruitus n(%) 0 514)
Urogenital   20(15) 44 (32)
  Breast pain n (%) 4(3) 14(10)
  Endometrial disorder n(%) 11(8) 21 (15)
TEAE = Treatment-emergent adverse event.

The following additional adverse reactions have been reported with estrogen and/or progestin therapy;

Genitourinary system

Changes in vaginal bleeding pattern and abnormal withdrawal bleeding or flow; breakthrough bleeding, spotting; dysmenorrhea!; increase in size of uterine leiomyomata; vaginitis including vaginal candidiasis; change in amount of cervical secretion; changes in cervical ectropion; ovarian cancer, endometrial hyperplasia; endometrial cancer.


Tenderness, enlargement, pain, nipple discharge, galactorrhea; fibrocystic breast changes; breast cancer,


Deep and superficial venous thrombosis: pulmonary embolism; thrombophlebitis; myocardial infarction; stroke; increase in blood pressure.


Nausea, vomiting; abdominal cramps, bloating; cholestatic jaundice; increased incidence of gall bladder disease: pancreatitis, enlargement of hepatic hemagiomas.


Chloasma or melasma that may persist when drug is discontinued; erythema multiforme; erythema nodosum; hemorrhagic eruption; loss of scalp hair; hirsutism; pruritis. rash.


Retinal vascular thrombosis, intolerance to contact lenses.

Central Nervous System

Headache, migraine, dizziness; mental depression; chorea; nervousness; mood disturbance; irritability; exacerbation of epilepsy, dementia.


Increase or decrease in weight; reduced carbohydrate tolerance; aggravation of porphyria; edema; arthralgia; leg cramps; changes in libido; urticaria, angioedema, anaphylactoid/anaphylactic reactions; hypocalcemia; exacerbation of asthma; increased triglycerides.

Read the Estrasorb (estradiol topical emulsion) Side Effects Center for a complete guide to possible side effects


Drug/Laboratory Test Interactions

  1. Accelerated prothrombin time, partial thromboplastin time, and platelet aggregation time; increased platelet count; increased factors II, VII antigen, VIII antigen, VIII coagulant activity, IX, X, XII, Vll-X complex, ll-VII-X complex, and beta-thromboglobulin: decreased levels of antifactor Xa and antithrombin III; decreased antithrombin III activity; increased levels of fibrinogen and fibrinogen activity; increased plasminogen antigen and activity,
  2. Increased thyroid-binding globulin (TBG) levels leading to increased circulating total thyroid hormone, as measured by protein-bound iodine (PBI), T4 levels (by column or by radioimmunoassay) or T3 levels by radioimmunoassay. T3 resin uptake is decreased, reflecting the elevated TBG. Free T4 and free T3 concentrations are unaltered. Patients on thyroid replacement therapy may require higher doses of thyroid hormone.
  3. Other binding proteins may be elevated in serum (i.e., corticosteroid binding globulin, and sex hormone binding globulin), leading to increased circulating corticosteroids and sex steroids, respectively. Free or biologically active hormone concentrations are unchanged. Other plasma proteins may be increased (angiotensinogen/renin substrate. alpha-1 -antitrypsin, ceruloplasmin).
  4. Increased plasma HDL and HDL-2 cholesterol subtraction concentrations, reduced LDL cholesterol concentration. and increased triglycerides levels.
  5. Impaired glucose tolerance.
  6. Reduced response to metyrapone test.

Last reviewed on RxList: 7/22/2011
This monograph has been modified to include the generic and brand name in many instances.

Side Effects

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