You go to collect your prescription and the pharmacy has none, with no clear date. Supply problems with hormone therapy have been a recurring feature in several countries, and the worst outcome — stopping abruptly and losing months of progress — is also the most avoidable.

Where we stand: Menova is an independent publication. We sell no hormones, we are not your doctor, and this is general education, not medical advice. Do not change products or doses on your own — a pharmacist or prescriber must make the switch.

What not to do

Do not simply stop. Symptoms return, often within weeks, and you lose the settling-in period you already paid for in side effects. If you have a uterus and are taking estrogen, do not stop only the progestogen — that combination is the one with real risk, because unopposed estrogen thickens the womb lining.

Do not stretch supplies by halving doses or skipping days. Erratic levels produce worse symptoms than a lower steady dose, and bleeding problems follow — see bleeding on HRT.

Do not buy hormones online without a prescription. Unregulated products have unknown contents and doses, no monitoring, and no endometrial protection built into the plan. This is the shortcut with genuine potential for harm.

Do not cut patches unless your pharmacist confirms your specific product allows it. Many are reservoir or matrix designs where cutting changes delivery unpredictably.

What to do instead

Ask the pharmacist first. They know current supply better than anyone, they can often say which equivalent products are in stock locally, and in some systems they can substitute directly under a serious shortage protocol. This one step resolves a large share of cases.

Ask specifically about equivalents rather than the same brand. Many products contain the same hormone at the same dose under different names. If you ask "do you have [brand]?" the answer is no; if you ask "what estradiol patches do you have in stock at any strength?" you often get somewhere.

Ring around before your supply runs out, not on the last day.

Then go back to your prescriber with what the pharmacy actually has. A prescriber who is told "they have X and Y in stock" can write a new prescription in minutes. A prescriber asked "what should I do?" has to guess at supply.

What switching involves

Most switches are routine.

Between brands of the same thing — patch to patch, gel to gel — is usually straightforward at an equivalent dose.

Between routes — patch to gel, gel to spray — is a normal adjustment. Doses are not interchangeable milligram for milligram, so the equivalence must be worked out by your prescriber or pharmacist.

Transdermal to oral is a bigger change, because oral estrogen goes through the liver first. It carries a different clot risk profile and can affect blood pressure and thyroid requirements. If you were on transdermal for a specific reason — migraine with aura, clot risk, high blood pressure, levothyroxine — say so, because that reason still applies. See HRT and blood clot risk, migraine with aura and HRT, and HRT and thyroid medication.

Progestogen switches are common and often produce the most noticeable difference in how you feel — see progesterone in menopause.

What to expect after switching

Give it a few weeks. Adjusting to a new product is normal and usually settles.

Things that commonly happen briefly:

  • A change in symptom control in either direction
  • Some breakthrough bleeding, particularly with a progestogen change
  • Skin reaction to a different adhesive, which is a brand issue rather than a treatment issue
  • A patch that will not stay on, since adhesive quality differs substantially — see getting HRT to actually absorb

If it has not settled after two or three months, that is a dose or product conversation rather than a failure — see is my dose too high or too low.

If nothing equivalent is available

Options to discuss:

  • A different strength, used differently — for example a lower-dose patch changed more often, or two patches, where appropriate
  • A different route entirely
  • A hormonal IUD for the progestogen component, which sidesteps oral progestogen supply altogether and lasts years
  • Non-hormonal prescription treatment as a bridge for vasomotor symptoms — see non-hormonal prescription options
  • Local vaginal estrogen, which is supplied separately and is worth continuing regardless, since genitourinary symptoms progress without treatment; see how to use vaginal estrogen

Reducing the chance of being caught out

  • Order your repeat prescription a week or two early, consistently
  • Keep a small buffer rather than running to the last patch
  • Know the generic name of what you take, not just the brand — estradiol, micronized progesterone, and so on. This is the single most useful thing when supply is tight
  • Photograph the box, so you have the exact strength and product name with you
  • Ask about a longer prescription duration if your system allows it
  • Note the reason you are on your particular route, so a substitution does not accidentally undo it
  • Travelling: take more than you need and keep it in hand luggage — see menopause and travel

Compounded products are not the answer

A shortage is exactly when compounded "bioidentical" hormones get marketed as the solution. They are not more reliable — doses are less predictable, quality control differs, and the safety claims made for them are not supported.

If you cannot get a regulated product, the answer is a different regulated product, not an unregulated one. See compounded versus regulated HRT and bioidentical hormones explained.

What to say at the pharmacy

"My product is out of stock. What estradiol patches or gel do you actually have available, at any strength? I'm on [product and dose], and I'm on transdermal specifically because of [reason]. Can you substitute, or do I need a new prescription?"

That gives the pharmacist everything needed to help, and it protects the reason you are on your particular route.

Our free printable visit prep sheet has space for your exact products and doses — worth filling in now rather than during a shortage. The free 30-day symptom tracker lets you see whether a switch changed anything, which is what the follow-up appointment turns on.

The free 2-minute Menova self-check organizes your wider symptom picture — no account, not a diagnosis, and your answers never leave your device.

Whatever else is going on, unexpected bleeding needs assessing rather than explaining away. Any bleeding after twelve months without periods, bleeding that is new or persistent on hormone therapy, or bleeding after sex should be assessed in person — see bleeding after menopause and bleeding on HRT.

This article is general education, not medical advice. Product substitutions and dose equivalences must be made by a pharmacist or prescribing clinician. Do not stop a progestogen while continuing estrogen, and do not obtain prescription hormones without medical supervision.

Sources: NHS — HRT, The Menopause Society, NICE NG23 — Menopause, and ACOG.