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Methylene blue injection is indicated for the treatment of pediatric and adult patients with acquired methemoglobinemia. Methylene blue is an oxidation-reduction agent indicated for the treatment of pediatric and adult patients with acquired methemoglobinemia.

Methylene blue is contraindicated in the following conditions: Severe hypersensitivity reactions to methylene blue or any other thiazine dye [see Warnings and Precautions (5.2) ]. Patients with glucose-6-phosphate dehydrogenase deficiency (G6PD) due to the risk of hemolytic anemia [see Warnings and Precautions (5.3, 5.4 )]. Methylene blue is contraindicated in the following conditions ( 4 ): Severe hypersensitivity to methylene blue Patients with glucose-6-phosphate dehydrogenase deficiency (G6PD) due to the risk of hemolytic anemia

Hypersensitivity: If severe or life threatening allergic reaction occurs, discontinue methylene blue, treat the allergic reaction, and monitor until signs and symptoms resolve ( 5.2 ) Lack of Effectiveness: Consider alternative treatments if there is no resolution of methemoglobinemia after 2 doses ( 2.1 , 5.3 ) Hemolytic Anemia: Discontinue methylene blue and transfuse ( 5.4 ) Interference with In-Vivo Monitoring Devices: Use methods other than pulse oximetry to assess oxygen saturation ( 5.5 ) Effects on Ability to Drive and Operate Machinery: Advise patients to refrain from these activities until neurologic and visual symptoms have resolved ( 5.6 ) 5.1 Serotonin Syndrome with Concomitant Use of Serotonergic Drugs and Opioids The development of serotonin syndrome has been reported with the use of methylene blue class products. Most reports have been associated with concomitant use of serotonergic drugs (e.g., selective serotonin reuptake inhibitors (SSRIs), serotonin and norepinephrine reuptake inhibitors (SNRIs), monoamine oxidase inhibitors (MAOIs). Opioids and dextromethorphan may increase the risk of developing serotonin syndrome. Some of the reported cases were fatal. Symptoms associated with serotonin syndrome may include the following combination of signs and symptoms: mental status changes (e.g., agitation, hallucinations, delirium, and coma), autonomic instability (e.g., tachycardia, labile blood pressure, dizziness, diaphoresis, flushing, and hyperthermia), …

Pregnancy: Only use during pregnancy if the potential benefit justifies the potential risk to the fetus. ( 8.1 ) Lactation: Discontinue breast-feeding for up to 8 days after treatment. ( 8.2 ) Hepatic Impairment: Monitor patients longer for toxicity and drug interactions due to delayed clearance. ( 8.7 ) 8.1 Pregnancy Risk Summary Methylene blue may cause fetal harm when administered to a pregnant woman. Intra-amniotic injection of pregnant women with a methylene blue class product during the second trimester was associated with neonatal intestinal atresia and fetal death. Methylene blue produced adverse developmental outcomes in rats and rabbits when administered orally during …