Compared with placebo-treated patients the occurrence of vasodilatation (hot flushes) was modestly increased in OPTRUMA patients (clinical trials for the prevention of osteoporosis, 2 to 8 years postmenopausal, 24.3% OPTRUMA and 18.2% placebo; clinical trials for the treatment of osteoporosis, mean age 66, 10.6% for OPTRUMA and 7.1% placebo).