Testosterone for Low Sexual Desire in Premenopausal Women: A randomized, double-blind, placebo-controlled trial: The SYBIL study
Womens' Health Research Program, Monash University Public Health and Preventative Medicine
260 participants
Jan 22, 2026
Interventional
Conditions
Summary
Low sexual desire with associated distress is the most common sexual dysfunction in women, with a prevalence in Australian premenopausal women in the order of 8%. Testosterone has been shown to be an effective treatment of low sexual desire with associated personal distress in postmenopausal women. However, while small studies suggest a potential benefit of testosterone for premenopausal women aged 35 to 45 years with low desire, the available data is insufficient to support its use in premenopausal women. Specifically, improvement in sexual desire, arousal and satisfaction with AndroFeme1® 10mg/day, was seen in a double-blind, placebo controlled pilot study of 34 women aged 35 to 45 years. Sexually-related personal distress was not evaluated in this study. In a separate study, another transdermal skin spray preparation improved the frequency of satisfying sexual events in premenopausal women compared with placebo, sexual desire did not improve and associated distress was not evaluated. However, testosterone blood levels in premenopausal women decline by about 25% between the ages of 18 to 39 years and continue to decline with age, but with little, or no change over the menopause transition. Therefore whether testosterone therapy is effective for the treatment of low sexual desire and associated personal distress in premenopausal women aged 35 to 50 years warrants investigation.
Eligibility
Inclusion Criteria15
- Premenopausal females aged 35-50 years with regular menstrual cycles and no vasomotor symptoms .
- Premenopausal women aged 35-50 years
- Regular menstrual cycles and no vasomotor symptoms; if amenorrhoea due to progestogen contraception (e.g. progestin-IUD), hysterectomy or endometrial ablation, women will be required to have no vasomotor symptoms
- A decrease in sexual desire of sufficient concern for the participant to seek medical advice or therapy as determined by an affirmative answer to the following questions:
- a. In previous years did you have satisfactory sexual desire?
- b. Has there been a decline in your sexual desire?
- c. Are you concerned about by your loss of sexual desire?
- d. Would you like to use a hormonal treatment that may improve your sexual desires?
- Currently sexually active or wishing to be sexually active - defined as being involved in any form of sexual activity.
- Willing to participate and able to understand and complete an English language questionnaire.
- Ability to give written informed consent
- Body Mass Index (BMI) 18kg/m2
- Currently using a medically acceptable form of contraception if a heterosexual sexual activity. Medically acceptable forms of contraception include hysterectomy, the oral contraceptive pill, implantable progestin, intrauterine devices, properly used barrier contraception, bilateral tubal ligation or involvement in a monogamous relationship with a partner who has had a vasectomy.
- In order to be eligible to enter the randomised treatment phase, participants must have a negative urine pregnancy test taken at week 0 Randomisation except those who are surgically sterile (e.g. bilateral tubal ligation or hysterectomy).
- Normal parameters for thyroid stimulating hormone in the past 2 years.
Exclusion Criteria28
- Participants who meet any of the following criteria:
- Have any of the following:
- a. Significant organic disorder of sexual function e.g. dyspareunia or vaginismus
- b. Severe depression (Beck Depression score >28)
- c. New onset of vasomotor symptoms
- If partnered,
- d. Relationship problems / poor feeling for partner
- e. Partner with sexual dysfunction or a current partner who is absent > 50% of time
- BMI 40kg/m2
- Current or past (within 2 years prior to randomisation) androgen therapy including testosterone implant, tibolone, oral DHEA, testosterone cream, gel or troches
- Use of more than one psychotropic medication
- Participants with one current psychotropic medication will not be excluded provided they have been on stable therapy for at least 6 months
- Known severe psychiatric illness or eating disorder
- Uncontrolled hypertension with systolic blood pressure of > 140 mmHg and/or diastolic blood pressure of >90mmHg.
- Sex hormone binding globulin (SHBG) > 50% above upper female reference range if on the combined oral contraceptive pill
- A significant medical condition (e.g. hepatic/renal cardiovascular, endocrine including Type 1 or 2 diabetes mellitus) or any other major illness or surgical procedures that have occurred within the last 6 months prior to randomisation
- Participants with treated hypertension, treated hyperlipidaemia or treated thyroid disease will not be excluded provided they have been on stable therapy for at least 6 months prior to randomisation
- Any history of malignancy except non-melanotic skin cancer
- Alcohol consumption > 3 standard drinks per day or any addiction to drugs or medication within the past 5 years prior to randomisation
- Suspicious breast lump or mammographic abnormality, personal history of breast cancer
- Currently on medications, herbal remedies known to be strong inducers/ inhibitors of CYP 3A4 affect the production (e.g. opiates, GnRH agonists) or action (e.g. spironolactone) of androgens
- Planning to fall pregnant, are pregnant or breast feeding
- Participants who have been recently pregnant or breast feeding and have returned to a normal regular menstrual cycle will not be excluded from the study
- Treatment with anti-androgens for hirsutism in the previous 5 years prior to randomisation or who are concerned by their level of facial or body hair excess or are experiencing scalp hair loss consistent with androgenic alopecia
- Current or recent (less than 3 months prior to randomisation) treatment with COCP containing an anti-androgenic progestin (e.g drospirenone, cyproterone acetate, dienogest)
- Current history of moderate or severe acne at screening, or systemic treatment for acne with anti-androgens or roaccutane in the preceding 5 years prior to randomisation
- In the opinion of the investigator, a poor medical or psychiatric risk for treatment in a research protocol.
- Participation in a medical or surgical research protocol in the 28 days prior to randomisation.
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Interventions
Active treatment contains 1% testosterone in a 50ml metered dose pump-pack. It is a transdermal cream delivering 0.25ml per pump (2,5mg dose of testosterone). The participant will be instructed to apply 2 or 4 pumps, equivalent to 5mg-10mg of testosterone, to the upper outer thigh or buttock daily for 6 months. The starting dose at Week 0 is 5mg of testosterone. It can be increased up to 10mg of testosterone if the participant reports no improvement in the sexual desire at week 12. Compliance will be assessed by collection and weighing of returned cream containers at week 12 and week 26 after commencement of treatment.
Locations(1)
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ACTRN12625001376437