Estrogen patches

An estrogen patch is a small, thin, sticky square that passes estradiol, a form of estrogen, through your skin and into your bloodstream. It is one of the ways to take HRT, alongside tablets, gel and spray.

The BMS guide to HRT preparations lists two kinds. Estradiol-only patches suit women who have had a hysterectomy, or women with a womb who take a progestogen separately. Combined patches carry a progestogen as well, in a sequential or a continuous pattern. You change a patch on set days, and the brand decides how often.

Most of the work is in where you put it. The NHS website says to stick it below the waist, on the thigh or buttock, and lists where not to: near the breasts, on cut, spotty or irritated skin, under a tight waistband, in a skin fold, on skin you have just creamed or powdered, or in direct sun. Peel off the old patch when the new one goes on, and use a different spot each time.

Sweat is the patch's main opponent. The NHS website advises waiting a while after putting it on before anything that makes you sweat. In a Karachi summer, that is worth planning around.

Some women get itchy or red skin under the patch. The NHS website says that if a rash or itch affects only the place where you put the estrogen, talk to your doctor, as you may need a different treatment.

How it differs from tablets

NICE NG23 says: "VTE risk is greater with oral than transdermal HRT." The NHS website puts it plainly too: "HRT patches, sprays and gels do not increase the risk of blood clots."

The BMS HRT guide lists reasons a doctor may choose the skin route: your own preference, poor relief from tablets, a gut condition affecting absorption, a history of clots in you or your family, a higher BMI, blood pressure that is hard to control, migraine, gallbladder disease and some other medicines.

What the PMS says about patches

The Pakistan Menopause Society's recommendations do discuss patches. They note that estradiol through the skin, patches included, has reportedly reduced the risk of clots (section 5.5), and that where HRT is considered after 60, very low-dose regimens, preferably through the skin, should be used (section 5.12). Its table of products currently available in Pakistan, though, lists no estradiol patch.

NICE NG23 recommends offering HRT for hot flushes and night sweats (1.5.1), and the PMS recommendations call it the most effective first-line medicine for them in women who can take it (section 7.1.1). Patch, gel or tablet is your doctor's call. In Pakistan, if the skin route is what you need, the PMS table points to gel.

See your doctor if the skin under the patch stays sore or itchy, if patches keep falling off, or if heavy or unexpected bleeding starts after the first six months. The NHS website says pain, redness or swelling in one leg, usually the calf, needs a doctor's advice straight away, and a lump or other change in a breast needs a GP appointment. Chest pain with breathlessness, or sudden weakness in the face, arm or leg, needs emergency help.

A patch stays on through washing, and that raises a question for ghusl and wudu: does water need to reach the skin underneath? Women ask it, often privately. That one belongs with a qualified scholar. Where to place the patch, and whether another route would make it simpler, is a fair question for whoever prescribes it.

One small mercy: below the waist, it is nobody's business but yours.