The use of ovulation induction combined with intrauterine insemination (IUI) as a treatment for subfertility in women with patent Fallopian tubes has increased in recent years. Little is known regarding the efficacy of this treatment in women aged >/=40 years. We reviewed our data in our ovulation induction with IUI programme for 168 consecutive patients aged >/=40 years undergoing a total of 469 cycles of treatment. Either sequential clomiphene citrate and human menopausal gonadotrophins or daily gonadotrophins were utilized along with timed IUI insemination. In 402 completed cycles, 28 clinical pregnancies occurred. The pregnancy loss rate was 34.4%. The overall ongoing/viable pregnancy rates per initiated and completed cycles were 4.47 and 5.22% respectively. No viable pregnancies occurred in 136 cycles in women aged >/=43 years. The ongoing/variable cycle fecundity rates for women aged 40, 41, and 42 years were 9.6, 5.2, and 2.4% per cycle respectively. When utilized in women aged >=40 years, ovulation induction with IUI is most likely to result in successful pregnancy in women 40-42 years of age. Women >/=43 years should consider other alternatives such as adoption or egg donation.