Generic Yaz: names and differences

Yaz is a brand name for a birth control pill containing drospirenone 3 mg and ethinylestradiol 20 mcg, taken as 24 active pills followed by 4 inactive ones. The generic version contains the exact same two hormones, in the same doses, in the same 24/4 pattern.

Once a brand's patent protection ends, other manufacturers can make and sell the same drug. They sell it under the chemical name, drospirenone and ethinyl estradiol, or under their own label rather than the name Yaz. Your pharmacy receipt might just read "drospirenone-ethinyl estradiol" with no brand name at all. The box looks different and the price is usually lower, but the hormone content inside is identical.

If you want the background on what Yaz does and who it's prescribed for, Yaz: what it is and whether it helps PMS covers that in full.

Pharmacologically, yes. A generic drug has to contain the same active ingredients, at the same strength, in the same dosage form, and absorbed into your body at a comparable rate and amount. Regulators require this bioequivalence testing before a generic can be approved to stand in for a brand-name pill. This is the same standard used for generic versions of most common medications, not something specific to birth control.

What can differ are the inactive ingredients: the fillers, binders, and dyes that hold the tablet together. These don't carry hormonal activity. For most women, switching from brand Yaz to a generic version changes nothing about how the pill works.

A small number of women notice a difference after switching, usually tied to one of those inactive ingredients rather than the hormones themselves. If that happens to you, mention it to your pharmacist or doctor, since a different generic manufacturer's formula might sit better.

For contraception and for moderate acne, generic drospirenone and ethinylestradiol pills work the same as brand Yaz, because approval for a generic depends on matching the brand's hormone delivery. The drospirenone/ethinylestradiol combination studied in trials is approved for contraception, and, in women who also choose it for contraception, for easing PMDD symptoms and moderate acne.

The clinical trials behind that approval were run on the branded formulation. Generics aren't retested in their own PMDD or acne trials. Instead, they rely on proving they deliver the same amount of hormone into your bloodstream as the brand does. That's the basis for calling them equally effective, not a separate trial on the generic pill itself.

For most women, this is a reasonable basis. If you've been stable on brand Yaz for acne or cycle symptoms, a generic switch is unlikely to change your results.

Drospirenone and ethinylestradiol, the two hormones in both brand and generic Yaz, have been studied for PMDD specifically. A 2007 review of drospirenone/ethinylestradiol trials (Drugs, 2007) found the 24/4 regimen improved emotional and physical PMDD symptoms over three treatment cycles, alongside its contraceptive effect. Two small trials (2007, 2017) tested it as an add-on in women with an existing depressive disorder whose symptoms flare before their period, a pattern called premenstrual exacerbation rather than PMDD itself. In both, symptoms improved, but the drug didn't outperform placebo on the main measure.

Because generic versions carry identical active hormones, the mechanism behind any improvement, drospirenone's antimineralocorticoid and antiandrogenic effects, should carry over. No study has separately retested a specific generic brand for PMDD, but none would be expected to behave differently given they contain the same drug at the same dose.

Niyora is a PMS and PMDD support app. If you're partway through a cycle on a new generic and want to track mood day by day rather than relying on memory, Niyora's Moon lets you write down what happened, see it from another angle, and calm down before you decide what to say. For more on the hormone itself, see Yaz for PMDD: does it work? and birth control for PMDD.

Generic drospirenone/ethinylestradiol pills differ from each other mainly in three places: manufacturer, inactive ingredients, and price.

• Manufacturer: multiple pharmaceutical companies can make the same generic once patent exclusivity ends, so your pharmacy might stock a different one month to month.
• Inactive ingredients: fillers, binders, lactose, and dyes vary by manufacturer. These don't affect the hormone dose but can occasionally cause a different reaction in someone sensitive to a specific filler.
• Price: generics are typically cheaper than the brand, which is often the main reason a pharmacy substitutes one.

The pill's shape, color, and packaging can also change between brands and even between refills of the same generic, which sometimes makes people worry the dose has changed when it hasn't. If you notice new side effects after a pharmacy switch, it's worth checking which generic you were given and comparing against Yaz side effects, including mood and confirming the schedule matches Yaz dosage: how much and when.

Switching to a generic isn't usually something that needs a doctor's visit on its own, since the hormones are the same. But if your mood symptoms don't improve, or they get worse after starting any version of this pill, that's worth tracking and raising with whoever prescribed it.

If low mood, anxiety, or irritability before your period takes up a week of every month, or you have thoughts of hurting yourself, see a GP or gynecologist and bring two months of daily notes. That record, generic or brand, active ingredient and dose, helps a doctor tell whether the pill is working, whether PMDD fits what you're describing, or whether something else needs attention.

For a wider look at what's behind these symptoms, see What is PMS? Premenstrual syndrome, explained.