How fast will I see breast development?

Tender budding typically appears in 1-3 months; visible growth from 3-6 months; final size by 1-3 years. Genetics determine the end-point.

Should I take progesterone too?

It's optional. Some patients find it helps with mood, breast development, or sleep; others find it sedating. It's normally introduced after the first 6-12 months.

What if my GP refuses shared care?

We continue your care fully privately, including prescriptions and blood-test monitoring. Nothing changes about your plan; the medication route just stays private until shared care is possible.

Do I need to stop oestrogen for surgery?

Many surgeons ask you to pause for 2-4 weeks before major operations to reduce VTE risk. We coordinate the timing with your surgical team.

Home / Medication guides / Estrogen Therapy

TRANS-FEMININE HRT · MEDICATION GUIDE

Estrogen Therapy therapy, a clear guide.

Sandrena gel is our default first-line oestrogen for feminising hormone therapy. Transdermal delivery (gel or patch) carries a significantly lower risk of venous thromboembolism than oral oestrogen, particularly for smokers or those with cardiovascular risk factors.

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Estrogen Therapy therapy, clinical reference image

Drug class

Oestrogen / oestradiol

Used for

Feminising HRT

Routes

Topical, patch, oral, sublingual

Frequency

Daily (gel)

Prescription

Specialist initiation

Targets

Oestradiol 400-800 pmol/L

On this pageOverview How it works Forms & dosing Effects timeline Side effects Cost FAQ

OVERVIEW

What estrogen therapy does, in plain English.

Oestrogen is the primary feminising hormone we prescribe. Sandrena (and similar transdermal gels) deliver it through the skin in a controlled daily dose, which gives steadier serum levels than oral routes and avoids first-pass liver metabolism.

Most feminising patients also take a testosterone blocker initially. Many transition off the blocker once oestrogen levels are well-suppressed.

Affirming, not gatekeeping.

We follow our normal informed-consent pathway. You don't need to prove anything to access oestrogen. What you need is a clinician who listens, and a plan that's safe and right for you.

HOW IT WORKS

The way it actually works.

Oestrogen binds to oestrogen receptors in skin, breast tissue, fat, bone, vocal cords, and the brain. Sustained therapeutic levels trigger a second puberty: breast development, fat redistribution, skin softening, reduced libido, and a slowing of body and facial hair growth. Our targets are oestradiol 400-800 pmol/L and testosterone <3 nmol/L.

Suppresses testosterone

Especially with a blocker; oestrogen alone at the right dose can also suppress.

Triggers breast development

Begins within 1-3 months; continues for 1-3 years; final size is genetic.

Steady levels matter

Big peaks and troughs cause mood swings; smooth, steady levels are the goal.

Lower VTE risk than oral

Transdermal routes avoid first-pass liver metabolism and the associated clot-risk increase.

FORMS & DOSING

Multiple ways to take it. Your choice, our guidance.

There's no single right answer. What matters is what fits your life. Most patients start on the simplest option and switch later if it suits.

Topical · Daily

Sandrena gel

Sandrena · Oestrogel · Divigel

A clear gel applied each morning to the inner thigh or lower abdomen. Default first-line.

Typical dose: 1 mg daily for 3 months, then 1.5 mg/day (1 mg am, 0.5 mg pm) until first review.

Pros

Steady daily levels

Lower VTE risk than oral

Easy to stop or pause

Watch-outs

Daily routine required

Sub-optimal absorption in low-BMI / very-low-cholesterol patients

Avoid skin-to-skin contact for several hours

Transdermal patch · Twice weekly

Evorel patches

Evorel · Estradot

A 100 mcg patch worn on the lower abdomen or buttocks, changed twice a week.

Typical dose: 100 mcg, changed twice weekly.

Pros

Steady levels

Set and forget for 3-4 days

Lower VTE risk than oral

Watch-outs

Skin irritation in some patients

Patches can fall off in heat / pools

Visible if uncovered

Oral or sublingual · Daily

Oral / sublingual oestradiol

Zumenon · Progynova · Estradiol valerate

Tablets used either swallowed whole or dissolved sublingually for faster absorption.

Typical dose: 2-6 mg daily, titrated to bloods.

Pros

Cheap and widely available

Useful when transdermal absorption is sub-optimal

Easy to dose-adjust

Watch-outs

Slightly higher VTE risk than transdermal

Not first-line for smokers / cardiovascular risk

Levels fluctuate with timing

EFFECTS TIMELINE

Changes over time.

Timelines vary between individuals. This is a typical picture of what most patients experience.

Phase

1-3 Months

Skin softening

Skin thins slightly and becomes softer; pores reduce.

Body odour

Becomes less acrid as testosterone falls.

Libido and erections

Both reduce; some patients welcome this, others find it adjustable with dose.

Emotional changes

Many patients describe feeling emotionally fuller: easier crying, calmer headspace.

SIDE EFFECTS & RISKS

What to watch for, and what to tell us.

Most feminising patients tolerate oestrogen well. The biggest risk to monitor is venous thromboembolism (VTE), much reduced with transdermal routes.

Common

Breast tenderness +

Especially in the first months as breast tissue grows. Usually settles.

Mood changes +

Some patients feel more emotionally fluid. If it's distressing, raise it at your next review.

Reduced libido and erections +

Common and expected. Adjust dose or add progesterone if it's a problem for you.

Site irritation (patches) +

Rotate sites; switching to gel often resolves it.

Less common / serious

VTE / blood clots +

Risk is small but real, much lower with transdermal than oral routes. Smoking, age, and cardiovascular risk factors increase it.

Liver enzymes +

Mild rises sometimes seen with oral oestrogen. We monitor LFTs.

Migraines +

Some patients experience migraines, particularly with oral routes. Switching to transdermal usually helps.

Monitoring schedule

We catch things early. Here's the routine you can expect.

Most of the testing is front-loaded while we fine-tune your dose. Once your levels are stable, it's usually just once a year.

Baseline

Full hormone panel

FBC, U&E, LFTs

Lipids, BP

3–6 months

Oestradiol level

Testosterone

LFTs

6-monthly while adjusting

Oestradiol, testosterone

LFTs

Prolactin

Yearly once stable

Full panel

BP, weight

Symptom review

COST

What estrogen therapy costs you, monthly.

Sandrena gel is one of the more affordable feminising options privately. NHS shared care drops the cost further.

Sandrena gel (private)

~£30 per month

Private prescription

Evorel patches (private)

~£40 per month

Private prescription

Once on shared care

£9.90 per item

Standard NHS Rx charge

HRT pre-payment certificate

£19.80 per year

Listed NHS HRT items (not testosterone/anti-androgens)

See full payment plan

FREQUENTLY ASKED

Questions, answered.

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