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

Amethyst 28 Day is a generally well-tolerated oral contraceptive, but like all hormonal birth control, it comes with a range of possible side effects — from very common and mild, to rare but serious. Knowing what to expect can help you decide whether to push through an adjustment period or call your provider.

The Most Common Side Effect: Unscheduled Bleeding and Spotting

The most distinctive and common side effect of Amethyst 28 Day is unscheduled bleeding or spotting. Because there is no placebo week, the uterine lining doesn't receive the cyclical hormonal withdrawal that triggers a normal period. Instead, irregular, light bleeding or spotting may occur unpredictably — especially in the first 3-6 months.

According to FDA clinical trial data, approximately 18% of women in Amethyst 28 Day studies discontinued the medication due to unacceptable bleeding patterns. However, for the majority who continue, unscheduled bleeding tends to decrease significantly after the first 3-6 packs. Many patients eventually experience very little or no bleeding at all.

Other Common Side Effects

The following side effects are common with Amethyst 28 Day and most combination oral contraceptives. Many improve after the first 1-3 packs:

Nausea: Most common in the first few weeks. Taking the pill with food or at bedtime can reduce nausea.

Headaches: Mild to moderate headaches are reported by some users, particularly during the first few months.

Breast tenderness or swelling: Typically mild and often resolves within 1-2 cycles.

Mood changes: Some patients report irritability, depression, or mood swings with hormonal contraceptives. If mood changes are severe, contact your provider.

Decreased libido: Reduced sex drive is a recognized side effect of some hormonal contraceptives, including levonorgestrel-containing pills.

Acne changes: Some patients experience initial acne flares; others see improvement. Levonorgestrel has mild androgenic activity, which can affect skin.

Weight changes: Fluid retention may cause a slight increase in weight. Significant weight changes are uncommon and may have other causes.

Blood pressure changes: Amethyst 28 Day may slightly raise blood pressure. Have your blood pressure checked regularly.

Serious Side Effects — Call Your Doctor Immediately

The following symptoms may indicate serious complications. If you experience any of these, stop taking Amethyst 28 Day and seek immediate medical attention:

Signs of blood clot (DVT/PE): Sudden leg pain, swelling, warmth, or redness; chest pain; shortness of breath; coughing up blood; sudden severe headache.

Signs of stroke: Sudden numbness or weakness on one side of the face or body, sudden confusion, trouble speaking, sudden vision problems, sudden severe headache.

Signs of heart attack: Chest pain, pressure or discomfort; pain spreading to arms, jaw, or back; nausea; sweating; dizziness.

Severe abdominal pain: May indicate a liver problem or ectopic pregnancy.

Vision changes or loss: Sudden blurred or lost vision may indicate a vascular event.

Jaundice (yellowing of skin or eyes): May indicate liver problems, which are a rare but recognized complication of oral contraceptives.

The Boxed Warning: Smoking and Age

Amethyst 28 Day carries an FDA boxed warning — the strongest type of warning — related to cigarette smoking. Women over 35 who smoke should not use combination oral contraceptives. Smoking combined with estrogen-containing birth control significantly increases the risk of serious cardiovascular events including stroke, heart attack, and blood clots. The risk increases with age and the number of cigarettes smoked.

How Long Do Side Effects Last?

Most common side effects of Amethyst 28 Day — including nausea, headache, and breast tenderness — tend to improve within the first 1-3 months as your body adjusts to continuous hormone levels. Unscheduled bleeding, the most common side effect specific to this formulation, typically decreases over 3-6 months of continuous use. If side effects remain severe or worsening after 3 months, talk to your provider about adjusting your formulation.

Managing Side Effects

Take Amethyst 28 Day at the same time every day — consistency reduces hormone fluctuations

Take it with food to minimize nausea

Give the medication at least 3 full packs before judging tolerability — many side effects resolve

Track side effects in a journal to share with your provider at follow-up

Also read our guide on Amethyst 28 Day drug interactions to learn which medications and supplements may reduce its effectiveness or increase side effect risk.