Intestinal parasites are common in reptiles and can range from harmless “hitchhikers” to serious infections that cause illness. At Tree of Life Exotic Pet Medical Center, we routinely screen reptile patients for parasites as part of their wellness care.
Some reptiles with parasites may show no obvious signs, while others may become quite sick.
Loose stools or diarrhea
Constipation
Black, tarry stools (melena)
Weight loss or poor body condition
In severe cases, lethargy or decreased appetite
Because signs can be mild or absent, regular wellness exams and fecal testing are the best way to detect parasites early.
Reptiles can host a variety of intestinal parasites:
Nematodes (roundworms):
Pinworms (oxyurids): Common in herbivores and omnivores, often not harmful and may even aid digestion in tortoises.
Strongyles & ascarids: Can cause illness if present in high numbers.
Cestodes (tapeworms): Less common, but can cause weight loss and digestive upset.
Trematodes (flukes): Rare in captive reptiles, more common in wild-caught animals.
Protozoans: Such as coccidia or flagellates (see our page on protozoan parasites).
Pentastomids (tongue worms): Rare, but occasionally found in reptiles fed wild prey.
Sometimes parasites seen in a fecal exam are actually “pseudoparasites” from recently eaten prey (like rodent or insect parasites), and not true infections in the reptile.
The primary diagnostic tool is a fecal exam:
Direct exam and flotation: A fresh fecal sample is mixed with a solution and examined under the microscope to look for eggs, cysts, or parasites.
Treatment depends on the type of parasite found and the reptile’s species and condition.
Husbandry correction: Proper temperatures, hygiene, and nutrition are critical to support the immune system and prevent reinfection.
Environmental cleaning: Remove waste promptly and disinfect enclosures to reduce re-exposure.
Supportive care: Fluids and assisted feeding may be needed in sick reptiles.
Common treatments include:
Roundworms & pinworms: Fenbendazole is often used, with different doses depending on the species.
Tapeworms & flukes: Praziquantel is typically prescribed, usually given in two treatments two weeks apart.
Medication and dosing should always be prescribed by a veterinarian experienced in reptile medicine.
With early detection and proper treatment, the prognosis for most reptile intestinal parasites is good. Left untreated, heavy infestations can lead to malnutrition, organ damage, or even death.
Schedule annual fecal exams as part of routine reptile wellness care.
Quarantine new reptiles before introducing them to your collection.
Keep enclosures clean and practice good hygiene.
Feed only safe, captive-bred prey and avoid wild-caught insects or animals.
A recheck fecal exam is recommended about 7–10 days after treatment ends to ensure parasites are cleared. Annual fecals are advised even for apparently healthy reptiles.
If your reptile has diarrhea, weight loss, or you’d like to schedule a routine parasite check, call Tree of Life Exotic Pet Medical Center today.
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