A larger study with longer follow-up concluded that "use of DMPA during pregnancy or breastfeeding does not adversely affect the long-term growth and development of children". This study also noted that "children with DMPA exposure during pregnancy and lactation had an increased risk of suboptimal growth in height," but that "after adjustment for socioeconomic factors by multiple logistic regression, there was no increased risk of impaired growth among the DMPA-exposed children." The study also noted that effects of DMPA exposure on puberty require further study, as so few children over the age of 10 were observed. 
Medroxyprogesterone acetate is metabolized primarily by hydroxylation via the CYP3A4. Though no formal drug interaction trials have been conducted, concomitant administration of strong CYP3A inhibitors is expected to increase concentrations of medroxyprogesterone acetate, whereas the concomitant administration of strong CYP3A inducers is expected to decrease medroxyprogesterone acetate concentrations. Therefore, coadministration with strong CYP3A inhibitors (., ketoconazole, itraconazole, clarithromycin, atazanavir, indinavir, nefazodone, nelfinavir, ritonavir, saquinavir, telithromycin, voriconazole) or strong CYP3A inducers (., phenytoin, carbamazepine, rifampin, rifabutin, rifapentin, phenobarbital, St. John's Wort) should be avoided.
Very common (10% or more): Amenorrhea (up to 68%), bleeding (up to %), uterine bleeding irregularities (up to 35%)
Common (1% to 10%): Dysmenorrhea, leukorrhea, vaginitis, intermenstrual bleeding, urinary tract infection, vaginal candidiasis, vaginitis, vaginitis bacterial, abnormal cervix smear, metrorrhagia, menometrorrhagia, menstruation irregular, vaginal hemorrhage, erectile dysfunction, genitourinary tract infection, pelvic pain, dyspareunia
Frequency not reported: Uterine cervical erosions, cervical discharge, vulvovaginal dryness, premenstrual syndrome, vaginal cyst, ovarian cyst, lack of return to fertility, sensation of pregnancy
Postmarketing reports: Unexpected pregnancy, uterine hyperplasia, oligomenorrhea, prolonged anovulation [ Ref ]