Antiprotozoals are used to treat certain parasitic infections, including giardiasis and amebiasis. Some also have other uses, such as treating or preventing pneumonia caused by Pneumocystis jirovecii. These medications work by killing the organisms that cause these infections. Antiprotozoals come in different forms, including oral tablets and injectable solutions. Examples include atovaquone (Mepron), nitazoxanide (Alinia), and pentamidine (Nebupent, Pentam 300). You can take these medications as prescribed to manage your condition effectively.