PMDD Treatment in the UK: What the Guidelines Actually Say

This is a map, not advice. I am not a clinician, I cannot tell you what is right for you, and nothing here should be used to start or stop a treatment. What I can do is tell you what exists, what the guidelines say, and how strong the evidence honestly is, so that you can walk into an appointment able to ask real questions.

The governing UK document is RCOG Green-top Guideline No. 48, on the management of premenstrual syndrome, with a patient-facing leaflet alongside it.

The genuinely surprising one: SSRIs for part of the month

This is the most distinctive thing in PMDD treatment and it deserves explaining properly.

In depression, an antidepressant is taken every day and takes weeks to work. In PMDD, RCOG notes that SSRIs can be taken daily for the two weeks before your period, or continuously through the whole cycle, and they are listed among the first-choice treatments for severe symptoms. They can also work within days rather than weeks.

Both of those facts are unusual, and they make sense once you understand that PMDD is a sensitivity to hormonal fluctuation rather than a classic depression.

But here is where I have to correct something you will read elsewhere. For years the accepted line, from a 2013 Cochrane review, was that luteal-phase-only dosing works just as well as continuous. That was superseded in 2024. The updated Cochrane review (34 trials, 4,563 women) found SSRIs probably reduce symptoms overall, and that they are probably more effective taken continuously (standardised effect -0.69) than in the luteal phase only (-0.39).

Luteal-only dosing is still a real, guideline-recognised option, and for some people the trade-off is worth it. It is simply not the free lunch the older evidence suggested.

Two more honest notes. Side effects are common and dose-related: nausea, tiredness, insomnia, sexual side effects. And the Cochrane authors themselves flag that 68% of the included trials were funded by pharmaceutical companies, with suspected publication bias. That does not make the finding wrong. It does mean a little scepticism is earned.

The pill, and the number nobody quotes

RCOG lists newer combined pills containing drospirenone among first-choice treatments, and notes that taking them continuously, without a break, may give better control.

The evidence, from a 2023 Cochrane review of five trials: a small-to-moderate effect against placebo (standardised effect -0.41), on low-certainty evidence.

And the number I think you deserve: in one trial, symptoms improved in 48% of women on drospirenone, and in 36% of women on placebo. The Cochrane authors note the difference may not be clinically significant.

That is a real effect. It is also a great deal more modest than the confidence with which the pill is often handed over. Knowing that in advance protects you from concluding you are a hopeless case when it does not transform your life.

CBT, which is in the guideline and rarely offered

RCOG patient information states plainly that CBT is known to help and should be offered as a treatment option. That is a strong sentence in a UK guideline, and it is one worth quoting in an appointment, because CBT is very often not offered at all.

The underlying evidence is modest and graded low-quality, with moderate effects on anxiety and depression. But it is the strongest non-drug card in the deck, and unlike the supplement aisle, it is actually in the guidance.

Oestrogen, GnRH, and the last resort

Oestradiol patches or gel can improve symptoms. If you have a uterus, they must be combined with a progestogen to protect the womb lining, and they are not contraceptive. One honest wrinkle: the added progestogen can itself reintroduce PMS-type symptoms in some women.

GnRH analogues switch off ovulation entirely, producing a temporary, reversible menopause. RCOG positions these for severe symptoms where other treatments have failed. The effect in meta-analysis is large, which fits the model: turn the cycle off and the disorder turns off. Beyond six months there is a real risk to bone density, so add-back HRT is advised, with bone scans if used long term.

Surgery (removal of the uterus, ovaries and tubes) is an absolute last resort, for severe cases where everything else has failed. Two things you should know before anyone raises it:
- RCOG advises a trial of GnRH analogues plus HRT for three to six months first, because it mimics the hormonal effect of the surgery and shows whether it would actually help.
- Endometrial ablation, or a hysterectomy that leaves the ovaries in, is NOT recommended for PMS. It does not address the mechanism. If it is offered to you for this reason, that is worth questioning.

The supplement aisle, and one genuine danger

RCOG is blunt: many women find complementary therapies helpful although there is little evidence that they are effective.

Calcium has the best supplement evidence (a decent 1998 trial in 466 women, at 1200mg a day), though it was a PMS trial rather than a PMDD trial. Agnus castus has some trial support. Evening primrose oil may help breast tenderness specifically, which is a much narrower claim than the marketing implies.

Now the part that could actually protect you.

Vitamin B6 can cause permanent nerve damage at high doses. The NHS states that taking 200mg or more a day can cause peripheral neuropathy, a loss of feeling in the arms and legs, and that the effects may be permanent if high doses are taken for months. The UK advice is to take no more than 10mg a day in supplements unless a doctor tells you otherwise.

PMS supplements sold online routinely contain 50mg or 100mg. Plenty of PMDD listicles cheerfully recommend exactly that. Please check the label on anything you are taking, and talk to a pharmacist. This is one of the few places where a blog post can genuinely spare you an injury.

And a flat statement, since nobody else seems willing to make it: no diet, no seed cycling, no "hormone balancing" product treats PMDD. There is no imbalance to correct. Your hormones are already normal. Anything sold to you on that premise is sold on a false one.

What to take into the room

• A two-cycle symptom chart. Without it, everything above is a conversation about vibes.
• The question: "RCOG lists SSRIs and drospirenone-containing pills as first-choice options, and says CBT should be offered. Which of those would you consider for me, and why?"
• The follow-up: "If those do not work, at what point would you refer me to gynaecology?"

You are allowed to ask these. You are allowed to know what the guideline says about your own body.

> A note on the links above: some are Amazon affiliate links, which means I may earn a small commission if you buy through them, at no extra cost to you. I only ever point to books I genuinely believe help. And nothing here is medical advice; if you're struggling, please see the support resources.