Mircette 28 Day Side Effects: What to Expect and When to Call Your Doctor

Mircette 28 Day (desogestrel/ethinyl estradiol) is generally well-tolerated, but like all hormonal contraceptives, it can cause side effects in some users. Most side effects are mild and often improve after the first 1–3 cycles. A small number of side effects are serious and require immediate medical attention. Here's what you need to know.

Boxed Warning: Smoking and Cardiovascular Risk

Mircette 28 Day carries an FDA boxed warning — the most serious type of drug warning. The warning states:

Cigarette smoking increases the risk of serious cardiovascular side effects from oral contraceptive use. This risk increases with age and with the amount smoked (15 or more cigarettes per day) and is quite marked in women over 35 years of age. Women who use oral contraceptives should be strongly advised not to smoke.

If you smoke and are over 35, do not use Mircette or any combined oral contraceptive. Talk to your provider about progestin-only or non-hormonal alternatives.

Common Side Effects (Usually Mild and Temporary)

These side effects are frequently reported and typically improve within 1–3 months of use:

Nausea — most common when starting; take your pill with food or at bedtime to reduce this

Headaches — may occur, especially during the hormone-free or low-dose days; Mircette's low-estrogen tail is designed to reduce this

Breast tenderness or swelling — usually temporary; resolves in most cases by the second or third month

Irregular bleeding or spotting — especially in the first 1–3 cycles; breakthrough spotting is common

Mood changes — some users experience mood swings, irritability, or low mood; if persistent, discuss with your provider

Weight changes — minor weight fluctuation may occur, often due to fluid retention

Decreased libido — some users experience changes in sex drive while on hormonal contraceptives

Contact lens intolerance — hormonal changes can affect corneal curvature; notify your eye doctor if this occurs

Serious Side Effects — Call Your Doctor Right Away

While uncommon, some side effects require urgent medical evaluation. Do not ignore these symptoms:

Blood clots: signs include sudden leg pain, swelling, redness, or warmth (DVT); or sudden shortness of breath and chest pain (PE). Seek emergency care immediately.

Stroke: sudden severe headache, vision changes, confusion, one-sided numbness or weakness, trouble speaking — call 911 immediately

Heart attack: chest pain or pressure, pain radiating to arm or jaw, nausea, sweating — call 911 immediately

Liver problems: yellowing of skin or eyes (jaundice), severe abdominal pain — call your doctor

Severe depression: new or worsening depression, especially with suicidal thoughts — contact your provider immediately

High blood pressure: Mircette can raise blood pressure; have it monitored regularly, especially in the first few months of use

Gallbladder disease: right upper abdominal pain after eating fatty foods may indicate gallstones — have it evaluated by your doctor

Mircette's Unique Design and Side Effects

One of Mircette 28 Day's design features is its "hormone bridge" — instead of a full hormone-free week, days 24–28 contain a very low dose of estrogen (0.01mg). This was intended to reduce the estrogen-withdrawal symptoms some women experience during the placebo phase, particularly headaches and spotting. Clinical data generally supports that this design reduces breakthrough bleeding compared to standard 7-day placebo pills.

When Side Effects Are a Sign to Switch

Side effects that persist beyond 3 months or significantly impact quality of life warrant a conversation with your provider about alternative formulations. If mood changes are a primary concern, a pill with a different progestin (such as drospirenone in Yaz) may be preferable. See our guide to Mircette alternatives and our overview of Mircette drug interactions for more information.