Give list of all drugs, summary of all drugs, DOC mentioned for different disease and provide a short table of treatment of african tympanosoma and american tympanosoma
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Antiprotozoal Drugs - Complete Summary
1. Complete Drug List
Amebiasis Drugs:
Metronidazole, Tinidazole, Chloroquine, Emetine, Dehydroemetine, Iodoquinol, Diloxanide furoate, Paromomycin, Doxycycline, Nitazoxanide
Antimalarial Drugs:
Primaquine, Chloroquine, Atovaquone-Proguanil (Malarone), Mefloquine, Quinine, Artesunate, Artemether, Dihydroartemisinin, Lumefantrine, Sulfadoxine, Pyrimethamine, Dapsone, Trimethoprim, Proguanil, Amodiaquine, Halofantrine, Doxycycline
Trypanosomiasis Drugs:
Pentamidine, Suramin, Melarsoprol, Eflornithine, Nifurtimox, Benznidazole
Leishmaniasis Drugs:
Amphotericin B, Sodium stibogluconate, Meglumine antimoniate, Pentamidine, Paromomycin, Miltefosine
Toxoplasmosis Drugs:
Sulfadiazine, Pyrimethamine, Leucovorin, Clindamycin, Trimethoprim/Sulfamethoxazole
Giardiasis Drugs:
Metronidazole, Tinidazole, Nitazoxanide, Albendazole, Paromomycin
2. Summary of All Drugs
AMEBIASIS DRUGS
| Drug | Class/MOA | Key Points | Adverse Effects |
|---|---|---|---|
| Metronidazole | Nitroimidazole; nitro group acts as electron acceptor forming cytotoxic compounds that bind proteins & DNA | Oral; effective against both luminal and systemic amebiasis; DOC for mild-to-severe intestinal infection, hepatic abscess | Nausea, metallic taste, oral moniliasis, neutropenia, neurotoxicity (dizziness, paresthesia, ataxia), disulfiram-like reaction with alcohol, prolongs coumarin effect |
| Tinidazole | Same as metronidazole | Single dose option; better tolerated than metronidazole | Similar to metronidazole but milder |
| Chloroquine | 4-aminoquinoline | Used with metronidazole for amebic liver abscess; must follow with luminal agent | See malaria section |
| Emetine | Protein synthesis inhibitor (blocks chain elongation) | Parenteral (SC/IM); backup for severe amebiasis when metronidazole cannot be used | Pain at injection site, nausea, cardiotoxicity (arrhythmias, CHF), neuromuscular weakness, dizziness |
| Dehydroemetine | Same as emetine | Preferred emetine (IM); less cardiotoxic than emetine | Same as emetine |
| Iodoquinol | Luminal amebicide; mechanism not fully defined | Oral; effective against luminal trophozoites and cysts; alternative to diloxanide | Rash, GI upset, dose-related peripheral neuropathy, rare optic neuritis, thyroid enlargement (high doses) |
| Diloxanide furoate | Luminal amebicide | Oral; DOC for asymptomatic amebiasis; used with other drugs for mild intestinal amebiasis | Mild GI symptoms |
| Paromomycin | Aminoglycoside antibiotic; luminal amebicide | May be superior to diloxanide for asymptomatic infection; also active against Cryptosporidiosis and Leishmaniasis; used in giardiasis in pregnancy | Headaches, dizziness, rash, arthralgia (if absorbed in renal insufficiency) |
| Nitazoxanide | Active against various protozoans and helminths | Active against metronidazole-resistant strains; oral for 3 days in giardiasis; also for cryptosporidiosis | Not detailed in text |
| Doxycycline | Tetracycline antibiotic | Luminal amebicide; used with quinine for resistant malaria; daily prophylaxis for multidrug-resistant malaria | Not detailed here |
ANTIMALARIAL DRUGS
| Drug | Class/MOA | Key Points | Adverse Effects |
|---|---|---|---|
| Primaquine | 8-aminoquinoline; metabolites act as oxidants disrupting plasmodial mitochondria | Only drug preventing relapses of P. vivax & P. ovale (hypnozoites); tissue schizonticide + gametocide; not effective against erythrocytic stage alone | Hemolytic anemia in G6PD deficiency, abdominal discomfort, methemoglobinemia; contraindicated in pregnancy |
| Chloroquine | 4-aminoquinoline; inhibits heme polymerization; also interferes with DNA/RNA | DOC for prophylaxis in non-resistant regions (weekly); treats erythrocytic forms; concentrates in RBCs, liver, spleen | At low doses: minimal; at high doses: GI upset, pruritus, headache, blurred vision, retinal toxicity, QT prolongation, discoloration of nail beds; avoid in psoriasis, porphyria |
| Atovaquone-Proguanil (Malarone) | Atovaquone: inhibits mitochondrial electron transport + ATP/pyrimidine biosynthesis; Proguanil→Cycloguanil: inhibits plasmodial DHFR | For chloroquine-resistant P. falciparum; prevention and treatment; also alternative for P. jirovecii; take with food | Nausea, vomiting, abdominal pain, headache, diarrhea, anorexia, dizziness |
| Mefloquine | Exact mechanism unknown | Effective prophylaxis for all Plasmodium; treatment with artemisinin for multidrug-resistant P. falciparum; long half-life (20 days) | High doses: nausea, vomiting, dizziness, disorientation, hallucinations, depression; ECG abnormalities + cardiac arrest if combined with quinine/quinidine |
| Quinine | Cinchona alkaloid; inhibits heme polymerization; also interferes with DNA replication, RNA, and protein synthesis | Blood schizonticide; reserved for severe infections & chloroquine-resistant strains; usually combined with doxycycline, tetracycline, or clindamycin | Cinchonism (nausea, vomiting, tinnitus, blurred vision, vertigo), hemolysis in G6PD deficiency, blackwater fever; contraindicated in pregnancy |
| Artesunate | Artemisinin derivative; metabolized to toxic free radicals in parasite food vacuole | IV form for severe infections; blood schizonticide active vs. P. falciparum including multidrug-resistant strains + quinine-resistant | Nausea, vomiting, diarrhea; QT prolongation (high doses); hypersensitivity |
| Artemether | Same as artesunate | Used orally as Artemether + Lumefantrine for uncomplicated malaria | Same as artesunate |
| Dihydroartemisinin | Same class | Short half-life (1-3 h); not used alone for prophylaxis; best in combination | Same as artesunate |
| Lumefantrine | Mechanism unknown; similar to quinine/mefloquine | Minimal cardiotoxicity; used only as Artemether+Lumefantrine combination | Minimal |
| Pyrimethamine | Inhibits plasmodial DHFR (antifolate) | Blood schizonticide + sporonticide; never used alone; combined with sulfadoxine for malaria OR sulfadiazine for Toxoplasmosis | Megaloblastic anemia (reversed by leucovorin); severe hypersensitivity rash |
| Sulfadoxine | Inhibits dihydropteroate synthase (antifolate) | Fixed-dose combination with pyrimethamine for malaria | Not detailed separately |
| Dapsone | Inhibits dihydropteroate synthase | Antifolate antimalarial agent | Not detailed separately |
| Amodiaquine | Inhibits heme detoxification | Active against chloroquine-resistant strains | Hematologic toxicity: agranulocytosis and aplastic anemia |
| Halofantrine | Unknown MOA | Active against erythrocytic stages of all 4 human malaria species including chloroquine-resistant; NOT used for chemoprophylaxis | Quinidine-like cardiotoxicity (QT prolongation), embryotoxicity |
TRYPANOSOMIASIS DRUGS
| Drug | Class/MOA | Key Points | Adverse Effects |
|---|---|---|---|
| Pentamidine | Interferes with parasite RNA, DNA, phospholipids, and protein synthesis | IV/IM; for T. brucei gambiense early stage; also for P. jirovecii (nebulizer) and Leishmaniasis; does NOT enter CSF | Renal dysfunction (reversible), hyperkalemia, hypotension, pancreatitis, ventricular arrhythmias, hyperglycemia, life-threatening hypoglycemia |
| Suramin | Inhibits enzymes involved in energy metabolism | IV; for early-stage T. brucei rhodesiense (no CNS involvement); does NOT cross BBB; half-life >40 days; give test dose first | Nausea, vomiting, shock, urticaria, blepharitis, paresthesia, photophobia, renal insufficiency |
| Melarsoprol | Trivalent arsenical; reacts with sulfhydryl groups of enzymes in parasite and host | Slow IV; ONLY drug for late-stage (CNS) T. brucei rhodesiense; achieves trypanocidal levels in CSF | Reactive encephalopathy (fatal in 10%), peripheral neuropathy, hypertension, hepatotoxicity, albuminuria, hemolytic anemia in G6PD deficiency |
| Eflornithine | Irreversible inhibitor of ornithine decarboxylase → halts polyamine production → cessation of cell division | IV; first-line for late-stage T. brucei gambiense; short half-life requires frequent IV dosing; topical form used for facial hair in women | Anemia, seizures, temporary hearing loss |
| Nifurtimox | Reduction generates intracellular oxygen radicals (superoxide, H₂O₂) toxic to T. cruzi | Oral; for Chagas disease (T. cruzi); combined with eflornithine for late-stage T. brucei gambiense | Anaphylaxis, dermatitis, GI problems (may cause weight loss), peripheral neuropathy, headache, dizziness |
| Benznidazole | Similar to nifurtimox | Better tolerated than nifurtimox; for Chagas disease | Dermatitis, peripheral neuropathy, insomnia, anorexia |
LEISHMANIASIS DRUGS
| Drug | Key Points | Adverse Effects |
|---|---|---|
| Amphotericin B | IV infusion; for visceral leishmaniasis | Nephrotoxicity, infusion reactions |
| Sodium stibogluconate | Pentavalent antimonial; IV/IM; inhibits glycolysis and nucleic acid metabolism | Injection pain, pancreatitis, elevated LFTs, arthralgias, myalgias, GI upset, cardiac arrhythmias; resistance developing |
| Meglumine antimoniate | Pentavalent antimonial; IV/IM | Similar to sodium stibogluconate |
| Miltefosine | First oral drug for all three forms (visceral, cutaneous, mucocutaneous) leishmaniasis; unknown MOA (may interfere with phospholipids/sterols) | Nausea, vomiting; teratogenic - avoid in pregnancy |
| Paromomycin | IM; aminoglycoside | See amebiasis section |
TOXOPLASMOSIS DRUGS
| Drug | Role |
|---|---|
| Sulfadiazine + Pyrimethamine | DOC for toxoplasmosis |
| Leucovorin | Co-administered to prevent folate deficiency from pyrimethamine |
| Pyrimethamine + Clindamycin | Alternative |
| TMP/SMX | Alternative; also used for prophylaxis in immunocompromised patients |
GIARDIASIS DRUGS
| Drug | Role |
|---|---|
| Metronidazole | DOC - oral for 5 days |
| Tinidazole | Alternative - single dose |
| Nitazoxanide | Alternative - oral for 3 days |
| Albendazole | May also be efficacious |
| Paromomycin | Used in pregnancy |
3. Drug of Choice (DOC) Summary
| Disease / Condition | DOC / First-Line |
|---|---|
| Asymptomatic amebiasis | Diloxanide furoate |
| Mild-to-severe intestinal amebiasis | Metronidazole or Tinidazole + luminal agent |
| Amebic hepatic abscess | Metronidazole or Tinidazole + luminal agent |
| Malaria prophylaxis (non-resistant regions) | Chloroquine (weekly) |
| Malaria prophylaxis (chloroquine-resistant regions) | Mefloquine (weekly) |
| Malaria prophylaxis (multidrug-resistant) | Doxycycline (daily) or Malarone |
| Severe malaria / chloroquine-resistant | Quinine + doxycycline/tetracycline/clindamycin |
| P. vivax / P. ovale (prevention of relapses) | Primaquine |
| Quinine-resistant malaria | Artemisinins |
| Toxoplasmosis | Sulfadiazine + Pyrimethamine (+Leucovorin) |
| Giardiasis | Metronidazole (oral, 5 days) |
| Visceral leishmaniasis (oral) | Miltefosine |
| Filariasis (W. bancrofti, Brugia sp.) | Diethylcarbamazine |
| Onchocerciasis / Cutaneous larva migrans / Strongyloidiasis | Ivermectin |
| Schistosomiasis / Trematodes / Taeniasis | Praziquantel |
| Whipworm, Pinworm, Hookworm, Roundworm | Mebendazole |
| P. jirovecii pneumonia | TMP/SMX (pentamidine as alternative) |
| Late-stage African trypanosomiasis (T. b. rhodesiense) | Melarsoprol |
| Late-stage African trypanosomiasis (T. b. gambiense) | Eflornithine |
| Chagas disease | Nifurtimox or Benznidazole |
4. Treatment of Trypanosomiasis - Comparison Table
African vs. American Trypanosomiasis
| Feature | African Trypanosomiasis (Sleeping Sickness) | American Trypanosomiasis (Chagas Disease) |
|---|---|---|
| Causative organism | T. brucei gambiense / T. brucei rhodesiense | T. cruzi |
| Early stage (no CNS) | Pentamidine (T. b. gambiense) / Suramin (T. b. rhodesiense) | Nifurtimox / Benznidazole |
| Late stage (CNS involvement) | Eflornithine (T. b. gambiense) / Melarsoprol (T. b. rhodesiense) | N/A (same drugs used throughout) |
| First-line oral drug | None for CNS stage; Eflornithine is IV | Nifurtimox (oral) / Benznidazole (oral) |
| Route | IV/IM (parenteral) | Oral |
| MOA - Key drug | Eflornithine: inhibits ornithine decarboxylase; Melarsoprol: reacts with sulfhydryl groups; Suramin: inhibits energy metabolism enzymes | Nifurtimox: generates oxygen free radicals toxic to T. cruzi; Benznidazole: similar to nifurtimox |
| Combo option | Nifurtimox + Eflornithine (NECT) for late T. b. gambiense | Nifurtimox or Benznidazole (monotherapy) |
| BBB penetration needed? | Yes (late stage) - Eflornithine and Melarsoprol achieve CSF levels | Not applicable |
| Tolerability | Melarsoprol: severe (encephalopathy in 10%); Eflornithine: better tolerated | Benznidazole better tolerated than Nifurtimox |
Key distinction: African trypanosomiasis requires different drugs depending on both the subspecies (gambiense vs. rhodesiense) and the disease stage (with or without CNS involvement). American trypanosomiasis (Chagas) is treated orally with nifurtimox or benznidazole throughout disease course.
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