Eltrombopag

About Eltrombopag

Eltrombopag is a thrombopoietin receptor agonist: it prompts the bone marrow to make more platelets. The label approves it for persistent or chronic immune thrombocytopenia (ITP) in patients 1 year and older who have not responded well enough to corticosteroids, immunoglobulins or splenectomy, and only when the low count and the clinical situation raise the risk of bleeding; for low platelets in adults with chronic hepatitis C, to allow interferon based therapy to start and continue; and for severe aplastic anemia, both as first line treatment with immunosuppressive therapy from age 2 and in patients whose disease did not respond to immunosuppression. It is not for myelodysplastic syndromes. In ITP the usual start is 50 mg once a day from age 6, with 25 mg for children aged 1 to 5, for people of East or Southeast Asian ancestry and for people with liver impairment; the dose is then adjusted to the platelet count, up to 75 mg a day. The other indications have their own schedules, with daily doses as high as 150 mg in aplastic anemia.

The boxed warning has two parts: in chronic hepatitis C, eltrombopag with interferon and ribavirin raises the risk of hepatic decompensation, and in anyone it can cause severe, potentially fatal liver injury, so ALT, AST and bilirubin are checked before and during treatment and the drug is stopped by the label’s rules if they rise. Blood clots in veins and arteries, including portal vein thrombosis in chronic liver disease, can occur even at low or normal platelet counts, so the drug is not used to push counts to normal. In a trial in myelodysplastic syndromes more patients progressed to acute myeloid leukemia. Cataracts have developed or worsened, so an eye examination is done at baseline and during treatment. The label lists no contraindications. Across all indications the most common side effects were anemia, nausea, fever, raised ALT, cough, fatigue, headache and diarrhea.

Eltrombopag binds minerals, so it is taken without a meal or with a low calcium meal, at least two hours before or four hours after antacids, calcium rich foods and supplements containing iron, calcium, aluminum, magnesium, selenium or zinc; the tablets are swallowed whole. The drug is intensely colored and can interfere with laboratory tests for bilirubin and creatinine, so the lab should know the patient takes it. Pregnancy is avoided, with effective contraception during treatment and for at least seven days after the last dose, and breastfeeding is not recommended. Platelet counts are checked weekly at first and for at least four weeks after stopping. Alvaiz, a different eltrombopag product with 9 mg, 18 mg, 36 mg and 54 mg tablets, is not substitutable milligram for milligram with Promacta or its generics.

Taking Eltrombopag

How to take it

Take it once a day at the same time, on an empty stomach or with a meal low in calcium, and at least two hours before or four hours after antacids, dairy and calcium rich foods, or supplements with iron, calcium, aluminum, magnesium, selenium or zinc. Swallow the tablets whole; mix the oral suspension powder with cool water only and drink it right away, discarding any not taken within 30 minutes.

If you miss a dose

Skip the missed dose and take the next one at the regular time. Never take two doses in one day.

Storage

At room temperature in the original container, away from heat and moisture (not in the bathroom), out of reach of children.

Interactions to know about

Antacids and mineral supplements block its absorption unless spaced as above. It raises levels of rosuvastatin, and the label calls for a lower rosuvastatin dose and for caution with other OATP1B1 or BCRP substrates such as atorvastatin, methotrexate and imatinib. Tell laboratory staff you take it before blood tests.

This summarizes the official prescribing information. Your prescriber’s and pharmacist’s instructions, and the leaflet that comes with your medicine, take priority.

Why the cash price for Eltrombopag differs from pharmacy to pharmacy

Until 2025 eltrombopag was a brand only specialty product, and generics are still new: the number of makers grew quickly through 2026, so quotes differ widely by which generic a pharmacy stocks and when it bought it. Many retail pharmacies do not keep it on the shelf and order it in for one patient, which shows up in the quote; a pharmacy that fills it regularly can quote the same AB rated tablet for much less. Promacta is priced as a brand, and the oral suspension packets have fewer generic makers than the tablets.

Because the dose is adjusted to platelet counts, the strength on the prescription changes, and each change can mean a new fill with its own dispensing fee. A prescription written for Alvaiz is quoted as a brand, since it cannot be swapped for a Promacta generic at the counter.

Ways to pay less for Eltrombopag without insurance

• Ask for generic substitution if the prescription is for Promacta tablets; AB rated generics in every strength are on the market.
• Compare more than one pharmacy, since a pharmacy that orders eltrombopag in for one prescription may quote it very differently from one that stocks it.
• Ask the pharmacy whether it can source the generic before the prescription is sent, so a fill is not delayed while it is ordered.
• For Promacta or Alvaiz, ask the manufacturer whether its patient assistance program applies to someone paying cash.
• Once your dose has been stable and your counts are being checked less often, ask the prescriber whether a longer supply is appropriate.
• Upload the prescription to Script Unlock so licensed pharmacies can quote their cash price. You pay the pharmacy directly.

Questions to ask your pharmacist about Eltrombopag

1. 1.How should I time my dose around my calcium, iron or antacid products and my meals?
2. 2.Is my prescription for eltrombopag olamine, which has generics, or for Alvaiz, which does not swap?
3. 3.Which liver symptoms should make me call the prescriber right away?
4. 4.Does my statin dose need to change now that I take eltrombopag?

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