Tafenoquine Succinate
Generic Name: tafenoquine succinate
Brand Names:
Krintafel
11 DESCRIPTION KRINTAFEL contains tafenoquine succinate, an antimalarial agent for oral administration. The chemical name of tafenoquine succinate is (±) 8-[(4-amino-1-methylbutyl)amino]-2,6-dimethoxy-4‑methyl-5-[3-(trifluoromethyl)phenoxy]quinoline succinate. The molecular formula of tafenoquine succinate is C 24 H 28 F 3 N 3 O 3 •C 4 H 6 O 4 , and its molecular mass is 581.6 as the succinate salt (463.5 as free base). The structural formula is shown below.
Overview
11 DESCRIPTION KRINTAFEL contains tafenoquine succinate, an antimalarial agent for oral administration. The chemical name of tafenoquine succinate is (±) 8-[(4-amino-1-methylbutyl)amino]-2,6-dimethoxy-4‑methyl-5-[3-(trifluoromethyl)phenoxy]quinoline succinate. The molecular formula of tafenoquine succinate is C 24 H 28 F 3 N 3 O 3 •C 4 H 6 O 4 , and its molecular mass is 581.6 as the succinate salt (463.5 as free base). The structural formula is shown below.
Uses
1 INDICATIONS AND USAGE KRINTAFEL is indicated for the radical cure (prevention of relapse) of Plasmodium vivax malaria in patients aged 16 years and older who are receiving chloroquine therapy for acute P. vivax infection [see Dosage and Administration ( 2.2 )] . Limitations of Use • KRINTAFEL is NOT indicated for the treatment of acute P. vivax malaria. • Concomitant use of KRINTAFEL with antimalarials other than chloroquine is not recommended because of the risk of recurrence of P. vivax malaria [see Warnings and Precautions ( 5.6 )] . KRINTAFEL is an antimalarial indicated for the radical cure (prevention of relapse) of Plasmodium vivax malaria in patients aged 16 years and older who are receiving chloroquine therapy for acute P. vivax infection.
Dosage
2 DOSAGE AND ADMINISTRATION • All patients must be tested for glucose-6-phosphate dehydrogenase (G6PD) deficiency prior to prescribing KRINTAFEL. ( 2.1 ) • Pregnancy testing is recommended for females of reproductive potential prior to initiating treatment with KRINTAFEL. ( 2.1 ) • The recommended dose of KRINTAFEL in patients aged 16 years and older is a single dose of 300 mg administered as two 150-mg KRINTAFEL tablets taken together. ( 2.2 ) • Coadminister KRINTAFEL on the first or second day of chloroquine therapy for the acute P. vivax malaria. ( 2.2 ) • Administer KRINTAFEL with food.
Side Effects
6 ADVERSE REACTIONS The following clinically significant adverse reactions have been observed with KRINTAFEL and are discussed in detail in the Warnings and Precautions section: • Hemolytic anemia [see Warnings and Precautions ( 5.1 )] • Methemoglobinemia [see Warnings and Precautions ( 5.3 )] • Psychiatric effects [see Warnings and Precautions ( 5.4 )] • Hypersensitivity reactions [see Warnings and Precautions ( 5.5 )] Common adverse reactions (≥5%) were dizziness, nausea, vomiting, headache, and decreased hemoglobin. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact GlaxoSmithKline at 1-888-825-5249 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.
Interactions
7 DRUG INTERACTIONS Avoid coadministration with drugs that are substrates of organic cation transporter-2 (OCT2) or multidrug and toxin extrusion (MATE) transporters. ( 7.1 ) 7.1 Effect of KRINTAFEL on Organic Cation Transporter-2 (OCT2) and Multidrug and Toxin Extrusion (MATE) Substrates The effect of coadministration of tafenoquine on the pharmacokinetics of OCT2 and MATE substrates in humans is unknown. However, in vitro observations suggest the potential for increased concentrations of these substrates [see Clinical Pharmacology ( 12.3 )] which may increase the risk of toxicity of these drugs. Avoid coadministration of KRINTAFEL with OCT2 and MATE substrates (e.g., dofetilide, metformin).
Warnings
5 WARNINGS AND PRECAUTIONS • Hemolytic Anemia : G6PD testing must be performed before prescribing KRINTAFEL due to the risk of hemolytic anemia. Monitor patients for clinical signs or symptoms of hemolysis. ( 5.1 ) • G6PD Deficiency in Pregnancy or Lactation : KRINTAFEL may cause hemolytic anemia when administered to a pregnant woman with a G6PD-deficient fetus. KRINTAFEL is not recommended during pregnancy. A G6PD-deficient infant may be at risk for hemolytic anemia from exposure to KRINTAFEL through breast milk. Check infant’s G6PD status before breastfeeding begins. ( 5.2 , 8.1 , 8.2 ) • Methemoglobinemia : Asymptomatic elevations in blood methemoglobin have been observed. Initiate appropriate therapy if signs or symptoms of methemoglobinemia occur. 4 CONTRAINDICATIONS KRINTAFEL is contraindicated in: • Patients with G6PD deficiency or unknown G6PD status due to the risk of hemolytic anemia [see Warnings and Precautions ( 5.1 )] . • Breastfeeding by a lactating woman when the infant is found to be G6PD deficient or if the G6PD status of the infant is unknown [see Use in Specific Populations ( 8.2 )].
Pregnancy
8.1 Pregnancy Risk Summary The use of KRINTAFEL during pregnancy may cause hemolytic anemia in a fetus who is G6PD deficient. Treatment with KRINTAFEL during pregnancy is not recommended [see Warnings and Precautions ( 5.2 )] . Available data with use of KRINTAFEL in pregnant women are insufficient to establish a drug-associated risk of major birth defects, miscarriage, or adverse maternal or fetal outcomes.
Storage
16 HOW SUPPLIED/STORAGE AND HANDLING How Supplied KRINTAFEL tablets contain 150 mg of tafenoquine (equivalent to 188.2 mg tafenoquine succinate) and are pink, film‑coated, capsule-shaped, and debossed with ‘GS J11’ on one side. KRINTAFEL is supplied as follows: • Unit Dose Pack of 2 tablets in a bottle with child-resistant closure (NDC 0173-0889-39). Bottles contain a desiccant.
Frequently Asked Questions
What is Tafenoquine Succinate used for?▼
1 INDICATIONS AND USAGE KRINTAFEL is indicated for the radical cure (prevention of relapse) of Plasmodium vivax malaria in patients aged 16 years and older who are receiving chloroquine therapy for acute P. vivax infection [see Dosage and Administration ( 2.2 )] . Limitations of Use • KRINTAFEL is NOT indicated for the treatment of acute P. vivax malaria. • Concomitant use of KRINTAFEL with antimalarials other than chloroquine is not recommended because of the risk of recurrence of P. vivax malaria [see Warnings and Precautions ( 5.6 )] . KRINTAFEL is an antimalarial indicated for the radical cure (prevention of relapse) of Plasmodium vivax malaria in patients aged 16 years and older who are receiving chloroquine therapy for acute P. vivax infection.
What are the side effects of Tafenoquine Succinate?▼
6 ADVERSE REACTIONS The following clinically significant adverse reactions have been observed with KRINTAFEL and are discussed in detail in the Warnings and Precautions section: • Hemolytic anemia [see Warnings and Precautions ( 5.1 )] • Methemoglobinemia [see Warnings and Precautions ( 5.3 )] • Psychiatric effects [see Warnings and Precautions ( 5.4 )] • Hypersensitivity reactions [see Warnings and Precautions ( 5.5 )] Common adverse reactions (≥5%) were dizziness, nausea, vomiting, headache, and decreased hemoglobin. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact GlaxoSmithKline at 1-888-825-5249 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.
Can I take Tafenoquine Succinate during pregnancy?▼
8.1 Pregnancy Risk Summary The use of KRINTAFEL during pregnancy may cause hemolytic anemia in a fetus who is G6PD deficient. Treatment with KRINTAFEL during pregnancy is not recommended [see Warnings and Precautions ( 5.2 )] . Available data with use of KRINTAFEL in pregnant women are insufficient to establish a drug-associated risk of major birth defects, miscarriage, or adverse maternal or fetal outcomes.
What are the important warnings for Tafenoquine Succinate?▼
5 WARNINGS AND PRECAUTIONS • Hemolytic Anemia : G6PD testing must be performed before prescribing KRINTAFEL due to the risk of hemolytic anemia. Monitor patients for clinical signs or symptoms of hemolysis. ( 5.1 ) • G6PD Deficiency in Pregnancy or Lactation : KRINTAFEL may cause hemolytic anemia when administered to a pregnant woman with a G6PD-deficient fetus. KRINTAFEL is not recommended during pregnancy. A G6PD-deficient infant may be at risk for hemolytic anemia from exposure to KRINTAFEL through breast milk. Check infant’s G6PD status before breastfeeding begins. ( 5.2 , 8.1 , 8.2 ) • Methemoglobinemia : Asymptomatic elevations in blood methemoglobin have been observed. Initiate appropriate therapy if signs or symptoms of methemoglobinemia occur. 4 CONTRAINDICATIONS KRINTAFEL is contraindicated in: • Patients with G6PD deficiency or unknown G6PD status due to the risk of hemolytic anemia [see Warnings and Precautions ( 5.1 )] . • Breastfeeding by a lactating woman when the infant is found to be G6PD deficient or if the G6PD status of the infant is unknown [see Use in Specific Populations ( 8.2 )].
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Medical Disclaimer
This drug information is for educational purposes only and should not replace professional medical advice. Drug information is sourced from the FDA National Drug Code Directory and Structured Product Labeling. Always consult with a healthcare provider before starting, stopping, or changing any medication.