Tri-Sprintec 28 Day Side Effects: What to Expect and When to Call Your Doctor

Like all combination oral contraceptives, Tri-Sprintec 28 Day comes with a range of possible side effects — most of which are mild and temporary. Understanding what's normal, what's a concern, and what requires immediate medical attention will help you use this medication safely and confidently.

Boxed Warning: Smoking and Cardiovascular Risk

Tri-Sprintec 28 Day carries a boxed warning — the FDA's strongest warning — about the risk of serious cardiovascular events in women who smoke. Cigarette smoking significantly increases the risk of heart attack, stroke, and blood clots when combined with combination hormonal contraceptives. This risk increases with age and number of cigarettes smoked.

Women who are over 35 years old and smoke should NOT take Tri-Sprintec 28 Day. This is a contraindication, not just a caution. If you smoke and are approaching 35, discuss this with your prescriber.

Common Side Effects (Usually Temporary)

Most side effects are most noticeable in the first 1–3 months of taking Tri-Sprintec and often improve as your body adjusts. Common side effects include:

Breakthrough bleeding or spotting — Light bleeding between periods, especially in the first few months. Very common and usually resolves on its own. If it persists past 3 months, discuss with your provider.

Nausea — Often mild; taking the pill with food or at bedtime can help. Usually improves after the first month.

Headache — Mild headaches are common in the adjustment period. Severe or sudden-onset headaches are a warning sign (see below).

Breast tenderness — Often improves after the first few cycles. A well-fitting bra can help with discomfort.

Mood changes — Some women experience mild mood fluctuations. If you notice significant depression, anxiety, or emotional changes, tell your prescriber.

Decreased libido — A reduction in sex drive can occur with combination hormonal contraceptives. This may improve over time or may prompt a medication switch.

Bloating or weight changes — Some fluid retention or minor weight fluctuation may occur early in treatment.

Contact lens discomfort — Hormonal changes can affect corneal curvature; contact lens wearers may need to see their eye doctor.

Serious Side Effects That Require Medical Attention

While rare, serious side effects can occur. These require prompt medical evaluation — if you experience any of the following, call your doctor or seek emergency care:

Signs of a blood clot: Sudden vision loss, stabbing chest pain, shortness of breath, coughing up blood, leg pain or swelling (especially in one leg).

Signs of a stroke: Sudden numbness or weakness (especially one side of the body), sudden severe headache, slurred speech, vision or balance problems.

Signs of a heart attack: Chest pain or pressure, pain spreading to the jaw or shoulder, nausea, sweating.

Liver problems: Loss of appetite, upper stomach pain, tiredness, fever, dark urine, clay-colored stools, jaundice (yellowing of skin or eyes).

Severe depression: Significant worsening of depression or mood; thoughts of self-harm.

High blood pressure: Severe headache, blurred vision, chest pain, or significantly elevated blood pressure readings.

Who Is at Higher Risk for Side Effects?

Certain factors increase the risk of serious complications on Tri-Sprintec 28 Day:

Smoking (especially over age 35)

History of blood clots, stroke, or heart attack

Uncontrolled high blood pressure

Migraines with aura

Obesity (BMI ≥ 30)

Prolonged immobility (e.g., long-haul flights, post-surgery)

When to Call Your Doctor vs. Seek Emergency Care

Call your doctor for: persistent spotting after 3 months, significant mood changes, contact lens problems, or mild nausea that isn't improving. Seek emergency care for: any symptom of blood clot, stroke, or heart attack — do not wait for an appointment. Also review our guide on Tri-Sprintec drug interactions to make sure your other medications don't affect its safety or effectiveness. If you need help locating a pharmacy with Tri-Sprintec in stock, medfinder can assist.