Slynd
The other day, one of the many that is not this one, yesterday to be precise, I wrote a big long post about estrogen. Buried in the middle of that post was a brief paragraph about how Slynd can help with PMDD symptoms by shutting down the ovaries, but can also cause hypoestrogenism. Then today there is a post on the other sub describing exactly that. So I want to highlight it.
Slynd (Slinda in Europe) is a progestin only pill (POP) made of Drosperinone (DRSP). Slynd is one of only two POPs that can effectively shut down ovulation. The other is Cerezzette which is made of desogestrel and is awful for women with PMDD so we won’t talk about it. But be aware if someone you know is on Cerezzette most of this applies to them as well. The rest of the POPs are mini-pills, not designed to stop ovulation (though they might) and basically just an oral form of an IUD which have their own issues. For now we focus on Slynd.
Slynd is a progestin only pill (POP) made of Drosperinone (DRSP). Drosperinone is the progestin in Yaz. Even though it is a synthetic, not bioidentical, progestin drosperinone was designed to behave exactly like natural progesterone. So it is the kindest, gentlest, best progestin available.
What happens is this: Slynd stops ovulation. It shuts down the ovaries. The ovaries are where the estrogen is made. The estrogen is made by the follicules in the ovaries. With the ovaries shut down, the cycle is shut down, there are no follicules. So no estrogen. None at all.
That’s fine. For a few days. The existing Estradiol (E2) takes a bit to clear and then the hypoestrogenism (hypo = too little) starts to kick in and eventually leads to profound hypoestrogenism (way too little) after a week or two. The symptoms of hypoestrogenism can be far worse than the symptoms of PMDD. So she quits and we’re back to “I’ve tried everything and nothing works.”
But really she just needs some estrogen. Often the reason she’s on Slynd in the first place is because she was taken off a Combined pill to avoid the estrogen. But that is the synthetic Ethyl Estradiol (EE) in the COC. EE increases the risk of blood clots and can contribute to stroke if she has migraine with aura. It’s not “estrogen” that is the problem. It is that one specific form of estrogen.
The patch, used for HRT, contains a bioidentical Estradiol (E2) and delivers it directly to the blood stream. Bioidentical E2 is as close to natural as you can get and has none of the side effects EE has. It does not increase the risk of blood clots and does not increase the risk of stroke.
Interestingly hypoestrogenism is uncommon because Slynd is not as effective as it could be. Generally “shutting down the ovaries” means convincing the hypothalamus there is plenty of hormone circulating already so it doesn’t need to prod the system into producing Follicule Stimulating Hormone (FSH) or Lutenizing Hormone (LH). But Slynd just barely gets there. In about 93% of cases Slynd only manages to mostly convince the hypothalamus all is well and the hypothalamus will still produce a little pulse of GnRH to prod the pituitary gland into making a little FSH which results in a little follicular growth in the ovaries and a little estrogen is produced. Just enough actually. It’s as if the system is permanently stuck on day 7.
The other 7% just need supplemental estrogen so Slynd+patch “should” do the trick.