Once you start using a pen, it can typically be stored at room temperature for several weeks, but unopened pens need to stay refrigerated until first use
Harshfield EL, Pennells L, Schwartz JE, Willeit P, Kaptoge S, Bell S, Shaffer JA, Bolton T, Spackman S, Wassertheil-Smoller S, Kee F, Amouyel P, Shea SJ, Kuller LH, Kauhanen J, van Zutphen EM, Blazer DG, Krumholz H , Nietert PJ, Kromhout D, Laughlin G, Berkman L, Wallace RB, Simons LA, Dennison EM, Barr ELM, Meyer HE, Wood AM, Danesh J, Di Angelantonio E, Davidson KW
Patients with coexisting conditions like hiatal hernias may require additional evaluation
[2] Ongoing research comparing various long-acting estrogen esters suggests that estradiol cypionate provides a favorable pharmacodynamic window, but head-to-head trials remain limited and further study could clarify dosing equivalencies in diverse patient populations