Why is it so hard to get HRT? The access barrier women face.

There's a conversation about HRT types that almost never happens in the exam room, and it should happen before any prescription is written.

I remember trying to explain the differences to a friend who'd been handed a prescription for Premarin with zero context. She didn't know there were options. Most women don't. So let me lay them out.

Oral estradiol passes through your liver before reaching circulation. That hepatic first pass triggers changes in clotting factors, specifically increasing coagulation proteins. For most healthy women under 60, the absolute risk is small. But for women with obesity, migraine with aura, clotting history, or elevated cardiovascular risk, it matters.

The estrogen patch delivers estradiol through the skin directly into the bloodstream. No liver. No first pass. No clotting factor changes. Shufelt and Manson's 2021 paper in the Journal of the American Heart Association specifically highlighted that formulation, dose, and route of delivery all determine cardiovascular outcomes. The British Menopause Society calls transdermal estrogen 'clot-neutral.' That's a significant distinction that most primary care doctors never mention.

Estrogen gel works the same way as the patch but absorbs differently. Some women prefer it. Some find it messy. The pharmacokinetics are similar enough that NAMS considers them interchangeable for most patients.

Vaginal estrogen is a separate category entirely. Low-dose vaginal estrogen treats genitourinary syndrome of menopause, the dryness and tissue changes and urinary symptoms that affect up to 84% of postmenopausal women. The Kaufman et al. 2024 AUA/SUFU/AUGS guideline specifically recommends vaginal estrogen as first-line treatment. It has minimal systemic absorption. The FDA's own advisory panel noted it does not require a progestogen for endometrial protection. And yet, I still talk to women whose doctors won't prescribe it because of vague 'hormone concerns.' That's not caution. It's ignorance.

(Bear with me for one more paragraph of pharmacology, because this is the part that affects your actual prescription.)

Progesterone is required if you have a uterus, to protect the endometrium from unopposed estrogen stimulation. Micronized progesterone, sold as Prometrium, is body-identical. Medroxyprogesterone acetate, the synthetic progestin used in the WHI, is not. Lalitkumar's 2023 study showed fundamentally different breast cancer gene expression between the two. The Norwegian cohort study of 1.3 million women by Stoer et al. found the type of progestogen meaningfully affects breast cancer risk. If your doctor prescribes Provera instead of Prometrium without explaining why, ask. This is a core aspect of hormone replacement therapy that deserves clinical attention. The evidence supporting hormone replacement therapy for appropriate candidates has been consistent across multiple reanalyses and follow-up studies.