If you've exhausted the usual PMDD treatment options, SSRIs, lifestyle changes, the contraceptive pill, and you're still suffering, you may have started hearing about chemical menopause. And specifically, about a nasal spray called Synarel.

Sounds dramatic. Medically induced menopause, delivered via a spray up your nose. But for women with severe, treatment-resistant PMDD, it can be genuinely life-changing. Here's what you need to know before you bring it up with your doctor.

What is Synarel?

Synarel is the brand name for nafarelin acetate, a synthetic hormone in a class of drugs called GnRH agonists. It comes as a nasal spray and works on the pituitary gland in your brain, effectively telling your ovaries to stop producing oestrogen and progesterone.

The result is a temporary, reversible state of chemical menopause. No ovulation. No hormonal fluctuations. No luteal phase. And for women with PMDD, whose symptoms are driven entirely by the brain's sensitivity to those fluctuations, no PMDD episodes.

By shutting down the ovaries, Synarel eliminates the hormonal fluctuations that drive PMDD symptoms entirely. That's the goal, and for a lot of women, it delivers exactly that.

Why it's relevant for PMDD

Remember, PMDD is not caused by abnormal hormone levels. Your oestrogen and progesterone are completely normal. The problem is how your brain responds to their natural rise and fall across the cycle. Synarel doesn't fix that neurological sensitivity. It removes the trigger entirely. No hormonal fluctuation, no PMDD response.

Synarel is sometimes prescribed off-label for PMDD for exactly this reason, and it also doubles as a diagnostic tool. If your ovulation is stopped, your cycle fully suppressed, and your PMDD symptoms disappear, that helps confirm the diagnosis. If symptoms continue despite full suppression, other diagnoses may need exploring.

What using Synarel actually looks like

Synarel is a nasal spray, taken daily. One thing women are often warned about, and it's worth knowing ahead of time, is the taste. Unusual, salty, slightly chemical. Most people find it odd at first and get used to it fast.

The first few weeks can feel worse before they feel better. It's common to have a "flare" in hormone levels as your brain adjusts and down-regulates its stimulation of your ovaries. You may get PMDD-like symptoms during this window. Normal, expected, not a reason to stop, but it does mean you need extra support around you during the initial adjustment.

After that flare settles, usually within one to two months, a lot of women experience significant or complete relief from PMDD symptoms.

Add-back therapy: the essential companion

Here's the catch. Remove oestrogen from your system and you create menopausal side effects, hot flashes, night sweats, vaginal dryness among the most common. There's also bone density: the low oestrogen state and temporary menopause from nafarelin can cause a small amount of bone thinning, which may only partially recover after stopping treatment.

That's why Synarel is almost always used alongside "add-back therapy," a low dose of oestrogen (sometimes progesterone) added back in to manage menopausal side effects and protect bone density, without re-triggering PMDD. Getting the add-back dose right is a careful balancing act that needs close work with a knowledgeable specialist.

Is it permanent?

No. Your ovaries wake back up once you stop taking these medications, so it's temporary. Cycles may be irregular initially after stopping, then settle back into their normal routine. That reversibility is part of what makes Synarel appealing compared to some other GnRH options, you're not locked into a months-long injection if it isn't working.

That said, there's currently no research on the ongoing effectiveness of GnRH agonist treatment specifically in PMDD. Some patients do well initially, then find it doesn't suppress ovarian function quite as well over time. Another reason close monitoring with your specialist matters.

Who is Synarel suitable for?

Generally considered when other treatments have been tried and haven't given adequate relief. It's not first-line, it's typically explored after SSRIs, hormonal contraceptives, and lifestyle-based management have had a genuine trial. It's also sometimes used as a pre-surgical diagnostic step for women considering a bilateral oophorectomy, to confirm eliminating the hormonal cycle actually resolves symptoms before committing to permanent surgery, something I've written about in my own hysterectomy story.

It's not suitable for everyone. Women with a history of osteoporosis, significant bone density concerns, or certain other medical conditions need careful consideration. And it must not be used during pregnancy, non-hormonal birth control like condoms or a copper IUD is essential during treatment since hormonal methods may not be effective while on Synarel.

What to expect from the conversation with your doctor

A lot of GPs are unfamiliar with using Synarel for PMDD specifically, since it's off-label. You'll likely need a referral to a gynaecologist or reproductive endocrinologist experienced with both PMDD and GnRH agonist therapy. Going in with clear symptom tracking, showing the cyclical pattern over multiple months, strengthens your case significantly. More on how cycle tracking works for PMDD if you haven't started yet.

Worth asking your specialist about add-back therapy from the outset too, rather than waiting until side effects become a problem.

The bigger picture

Synarel is a significant medical intervention and it isn't the right fit for everyone. But for women with severe, treatment-resistant PMDD struggling to find relief elsewhere, knowing it exists, and knowing you can ask about it, matters enormously. Too many women suffer for years without ever being told this option is on the table.

Medication is one part of the puzzle. Alongside any medical treatment, having a solid framework for understanding your cycle, managing your nervous system, and building a life that works with your PMDD rather than against it makes a real difference in outcomes. That's exactly the work we do in 1:1 sessions, or PMDD Group Therapy if you want it alongside other women navigating treatment decisions like this one.

This blog is for informational purposes only and doesn't constitute medical advice. Synarel is a prescription medication with significant side effects that requires specialist supervision. Always discuss treatment options with your own doctor or gynaecologist.

Ready for support alongside your treatment?

Whether you're exploring Synarel, already on it, or still working out your treatment path, 1:1 counselling gives you support at every stage, alongside whatever your specialist has you doing medically, not instead of it.

Frequently asked questions

Is Synarel approved for PMDD in Australia? Synarel is approved in Australia for endometriosis and central precocious puberty. Its use for PMDD is off-label, meaning your doctor can prescribe it for this purpose but it isn't the primary approved indication. You'll likely need a referral to a specialist experienced in PMDD treatment.

How long does it take for Synarel to work for PMDD? Most women get the initial hormone flare in the first few weeks, with symptom relief beginning once the ovaries are fully suppressed, typically within one to two months. If your periods haven't stopped after two months of correct use, speak with your doctor.

Will I still need other PMDD management tools while on Synarel? Yes. Synarel addresses the hormonal trigger, but the emotional and relational patterns PMDD creates, shame spirals, relationship damage, nervous system dysregulation, benefit from ongoing therapeutic support alongside any medical treatment.

What happens when I stop taking Synarel? Your ovaries resume normal function and your cycle returns, usually within a few months. PMDD symptoms are likely to return with it. Synarel is most useful as a diagnostic tool, a bridge to surgery, or a medium-term management option under specialist supervision, not a permanent cure.

Can I take Synarel if I want to have children in the future? Yes, the effects are reversible and fertility typically returns after stopping the medication. You must use non-hormonal contraception during treatment though, since the medication doesn't reliably prevent pregnancy and can harm a developing baby.