Doptelet Side Effects: What to Expect and When to Call Your Doctor

Doptelet (avatrombopag) is a medication that increases platelet counts — but like all medications, it can cause side effects ranging from mild and manageable to serious and requiring immediate medical attention. Understanding what to expect when taking Doptelet helps you know what's normal and when to seek help.

The Most Important Thing to Know: Doptelet Can Cause Blood Clots

This is the most serious risk of Doptelet and the one that most patients are surprised by. Doptelet works by raising your platelet count. If platelet counts rise too high, this can increase the risk of blood clots — including deep vein thrombosis (DVT) in the legs, pulmonary embolism (PE) in the lungs, and portal vein thrombosis in the liver.

In clinical trials, thromboembolic events occurred in 7% of adult ITP patients receiving Doptelet, and portal vein thrombosis occurred in 0.4% of CLD patients. The risk is higher in patients who already have risk factors for thromboembolism (such as Factor V Leiden, antiphospholipid syndrome, or a history of blood clots).

Call 911 or Go to the Emergency Room Immediately If You Have:

Chest pain or pressure

Shortness of breath or difficulty breathing

Rapid or irregular heartbeat

Pain, swelling, warmth, or redness in one leg (DVT symptoms)

Sudden abdominal pain or swelling (possible portal vein thrombosis)

Signs of stroke: sudden weakness or numbness, severe headache, vision changes, speech difficulties

Common Side Effects of Doptelet in CLD Patients

In clinical trials involving CLD patients (the ADAPT-1 and ADAPT-2 trials), the most commonly reported side effects of Doptelet were:

Abdominal pain

Nausea

Headache

Fatigue (tiredness)

Peripheral edema (swelling in the extremities)

Pyrexia (fever)

Common Side Effects of Doptelet in ITP Patients

For ITP patients on long-term Doptelet therapy, the most commonly reported side effects include:

Bruising or contusions (can be related to the ITP itself)

Upper respiratory tract infections (URIs)

Nasopharyngitis (common cold symptoms)

Fatigue

Headache

Post-Marketing Side Effects Reported After Doptelet's Approval

After Doptelet was approved and entered widespread use, additional side effects were voluntarily reported to the FDA. These post-marketing reports include hypersensitivity reactions such as:

Pruritus (itching)

Rash (including macular rash)

Pharyngeal edema (swelling of the throat)

Facial swelling and swollen tongue

Choking sensation

If you experience any symptoms of an allergic reaction — especially throat swelling, difficulty breathing, or severe rash — stop taking Doptelet and seek emergency care immediately.

Side Effects in Pediatric Patients (Doptelet Sprinkle)

In the Phase 3 AVA-PED-301 pediatric trial, the most common adverse reactions (occurring in 10% or more of patients) included viral infection, nasopharyngitis, cough, pyrexia (fever), and oropharyngeal pain. The tolerability profile in children was generally consistent with what is seen in adults.

Pregnancy and Breastfeeding Warnings

Based on animal reproduction studies, Doptelet may cause fetal harm if taken during pregnancy. If you are pregnant or planning to become pregnant, tell your doctor before starting Doptelet. Breastfeeding is not recommended while taking Doptelet — patients should avoid breastfeeding during treatment and for at least 2 weeks after the last dose.

When to Call Your Doctor (Non-Emergency Symptoms)

Contact your doctor during regular hours if you experience persistent nausea, headache, or fatigue; any new or unusual bruising; symptoms that are worsening or interfering with daily life; or if you start taking a new medication (especially fluconazole or rifampin, which interact with Doptelet). For more on interactions, see our guide: Doptelet Drug Interactions: What to Avoid.