Male contraception study expands at UC Davis Health – UC Davis Health


Nina had tried multiple birth control options and was tired of the side effects: Mood swings, weight gain, inconsistent periods. When she spotted an Instagram post last winter advertising the clinical trial for a new reversible male contraception gel, she contacted the UC Davis Health research team.

“I had to find out more and see if we qualified,” Nina said.

Seven months later, she and her partner Daniel are part of the male contraception clinical trial, which began recruiting at UC Davis Health in June 2020.

“It’s gone well so far. No issues,” said Daniel, who applies a pump (about one teaspoon) of contraceptive gel to each of his shoulders the same time each day. This is their new birth control method.

Nina and Daniel are one of 31 couples recruited thus far in the Sacramento area, who have been part of the two-year Phase 2 clinical trial. The UC Davis Health researchers originally just hoped to enroll 12 couples. Other U.S. testing sites include Los Angeles, Seattle, Salt Lake City, Portland, Norfolk and Philadelphia, along with worldwide locations in the United Kingdom, Italy, Sweden, Kenya and Chile. The gel formulation was developed by the Population Council and NIH’s Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD).

The gel contains segesterone acetate, a synthetic progestin, which blocks natural testosterone production in the testes and reduces sperm production. The gel also contains replacement testosterone to help maintain normal sex drive and other functions dependent on the hormone.

Recruiting more couples

UC Davis has been so successful with recruiting that the National Institutes of Health (NIH) recently increased the funding at UC Davis Health, providing an additional $1.1 million to allow currently enrolled couples to finish the trial and to recruit at least 12 more couples to the two-year clinical trial.

Clinical trial participants Daniel and Nina during an appointment.

Eligibility criteria include the following:

  • Men must be between the ages of 18 and 50.
  • Women must be between the ages of 18 and 34 years and have regular menstrual cycles.
  • Couples do not need to be UC Davis Health patients to participate.

During the clinical trial, the man’s sperm count should be low enough to prevent pregnancy in about four months, but it can take up to six months. At that point, the couple will use the study contraceptive gel as their only form of birth control for 12 months. The man will have …….


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