Pyrimethamine is an antiprotozoal drug which is often combined with other agents in the treatment of various parasitic infections e.g malaria and toxoplasmosis. Watch this video to learn the in depth pharmacology of this drug. Timeline: 0.00 Overview and mode of administration 0.47 Administration 1.00 Combination 1.23 Uses 2.33 Adverse reactions 3.04 Contraindications and warnings 5.39 Drug interactions 6.33 Pregnancy and lactation 7.27 Monitoring 7.50 Doses for different indications