Comment Re:Just because it's a parasite... (Score 1) 165
This is a complete misconception. Although rare, some antibiotics can be effective antiparasitics, given that protozoa and bacteria share some cellular pathways. Metronidazole (Flagyl) and TMP-SMX (Bactrim) are great examples, the former by causing double-stranded DNA breaks, the latter by inhibiting folate synthesis which is needed for DNA replication.
Doxycycline is first-line for malaria prophylaxis but not as a monotherapy because it is only effective in the first cycle of Plasmodia infection. However, in this prophylactic role it is very effective, and used by hundreds of thousands of travellers every year. Calling it akin to paracetamol is gravely misinformed.
Source: I'm a third-year US allopathic medical student.