SSRI for PMDD side effects, including mood

SSRIs raise how much serotonin is available in your brain, and serotonin also acts in your gut, skin and blood vessels. That's why the common side effects of SSRIs reach past mood.

Most start in the first one to two weeks, while your body adjusts:

• Nausea or an upset stomach
• Headache
• Trouble falling asleep, or feeling drowsy during the day
• Dry mouth, or sweating more than usual
• Feeling jittery or restless
• Lower interest in sex, or trouble reaching orgasm

A 2006 expert guideline on using SSRIs for PMDD and severe PMS describes taking the medicine only in the two weeks before your period as an alternative to taking it every day [3]. That means a lower total monthly dose, which can mean fewer side effects for some women. See SSRIs dosage: how much and when for how that timing works.

Side effects can also differ between specific SSRIs, so if one bothers you, switching rather than stopping altogether is often worth asking your doctor about.

Yes, in a few different ways:

• Feeling calmer and less reactive, often the goal when PMDD makes normal hormone shifts feel overwhelming
• Feeling flatter than usual, like your emotions are muted, which can be unsettling if you're used to feeling things strongly
• Feeling more anxious or on edge early on, in a smaller number of people, before it settles
• New or worsening thoughts of self-harm, in rare cases, especially in the first weeks or right after a dose change

That's why all SSRIs carry a caution to watch mood closely during that window.

If you're trying to tell a side effect apart from a reaction to something real, writing down what you noticed and when can help you see the pattern. Niyora is a PMS and PMDD support app. Its Moon feature lets you write down what happened, so you can look back and see whether a low mood lines up with a new dose or with your usual premenstrual week.

Call your doctor if a mood change feels wrong, rather than waiting for your next appointment. SSRIs for PMDD: does it work? covers how the mood benefit itself usually shows up for PMDD specifically.

Some women gain a little weight on SSRIs over months of daily use, some lose a little at first as nausea cuts their appetite, and many notice no real change at all. It varies a lot person to person, and there isn't dedicated trial data on weight specifically for the luteal-phase-only dosing used in PMDD.

Because many women taking an SSRI for PMDD only take it the two weeks before their period, the total monthly dose is lower than someone taking the same SSRI every day for depression [3]. That may mean less weight change too, though no one has tested this directly.

If weight shifts worry you, it's reasonable to bring that up with your doctor and weigh it against other paths. PMS treatment: what actually helps and SSRIs for PMS: does it work? cover some of those other options.

Nausea, headache and jitteriness are usually worst in the first couple of weeks, then ease as your body adjusts. Sleep changes often improve on a similar timeline.

Sexual side effects, like lower desire or trouble reaching orgasm, can stick around for as long as you keep taking the medicine. They tend not to fade the way early stomach or sleep symptoms do.

If you're on a luteal-phase-only plan, you get a short run of side effects right as your usual premenstrual symptoms are starting to ease on their own, which can make it hard to tell which is which. Niyora's estimated PMS window can help you line up the dates, so you can see which days are the medicine and which are the days before your period doing what they always do.

How long does SSRIs take to work? covers the separate question of when the mood benefit itself kicks in, which usually follows a different timeline than the side effects.

Don't stop a daily SSRI on your own without talking to your doctor first. Stopping suddenly after weeks of daily use can cause withdrawal-like symptoms: dizziness, odd electrical-feeling sensations, irritability or trouble sleeping.

What to do instead:

1. If side effects are mild, give it two weeks. Most early ones ease as your body adjusts.
2. If side effects are severe enough that you can't function, call your doctor rather than stopping on your own.
3. If you're on a luteal-phase-only plan, it ends naturally each cycle, so there's usually nothing to taper, but check this with whoever prescribed it.
4. If your mood feels worse, not better, or something feels unsafe, call your doctor before your next dose.

SSRIs aren't the only option, and some women use something else instead or alongside it.

None of these are a substitute for a conversation with your doctor about what fits your symptoms and your life. What is PMS? Premenstrual syndrome, explained covers the bigger picture of these options together.