At high doses, the duration of action of gestonorone caproate by intramuscular injection has been found to be at least 21 days. Clinical studies have found gestonorone caproate to be satisfactorily effective as a progestogen when injected once a month, whereas it was poorly effective as an injectable contraceptive when it was injected once every two months.
Gestonorone caproate's duration of action and effectiveness as a progestogen are influenced by the dosage and injection frequency. Clinical studies have shown that high doses administered intramuscularly last for at least 21 days, while it was less effective when given every two months.