Its possible to have injections of vitamin C, vitamin D, and vitamin H via injections, and these are useful if you struggle to reach your recommended daily intake of certain essential nutrients and vitamins
Drug Interactions Drug Interactions Affecting Co-administered Drugs: Antibiotics: Thiamine, riboflavin, pyridoxine, niacinamide and ascorbic acid decrease activities of erythromycin, kanamycin, streptomycin, doxycycline and lincomycin (7.1) Bleomycin: Ascorbic acid and riboflavin may reduce the activity of bleomycin (7.1) Levodopa: Pyridoxine may decrease blood levels of levodopa and levodopa efficacy may decrease (7.1) Phenytoin: Folic acid may decrease phenytoin blood levels and increase risk of seizure (7.1) Methotrexate: Folic acid may decrease response to methotrexate (7.1) Drug Interactions Affecting Vitamin Levels: Use In Specific Populations See 17 for PATIENT COUNSELING INFORMATION

Pemetrexed Dosage and Administration 2.1 Recommended Dosage for Non-Squamous NSCLC The recommended dose of pemetrexed for injection when administered with pembrolizumab and platinum chemotherapy for the initial treatment of metastatic non-squamous NSCLC in patients with a creatinine clearance (calculated by Cockcroft-Gault equation) of 45 mL/min or greater is 500 mg/m2 as an intravenous infusion over 10 minutes administered after pembrolizumab and prior to carboplatin or cisplatin on Day 1 of each 21-day cycle for 4 cycles
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