This list covers 7 poisons, ranging from “Xanax (Alprazolam)” to “Xanthotoxin (Methoxsalen)”. These substances come from very different sources, including prescription medications, industrial solvents, veterinary drugs, and common plants. Some are everyday products found in medicine cabinets, garages, and gardens, while others turn up unexpectedly in sweeteners, food, or the illegal drug supply.
Poisons are substances that harm the body when they enter it in high enough amounts, whether through swallowing, breathing, or skin contact. Some occur naturally in plants, while others are man-made chemicals or medications that turn dangerous outside their intended use. Xylitol is a good example: it’s a popular sugar substitute that’s completely safe for people but can send a dog into a life-threatening blood sugar crash within minutes.
Below you’ll find the table with poison, source, effects, antidote, and description.
Poison: the name of the toxic substance, so you can quickly find the specific item you’re looking for.
Source: where the poison comes from or how it’s typically encountered, helping you understand its origin.
Effects: what happens to the body after exposure, so you know the signs and symptoms to watch for.
Antidote: the treatment or reversal agent doctors use to counter the poison’s effects, if one is available.
Description: a short summary that puts the poison in context, explaining where it comes from and why it’s dangerous to people or animals.
Poisons
| Poison | Source | Effects | Antidote |
|---|---|---|---|
| Xanax (Alprazolam) | Prescription benzodiazepine medication | Overdose causes extreme drowsiness, confusion, and slowed breathing, and can be fatal when combined with alcohol or opioids | Flumazenil |
| Xylazine | Veterinary sedative (alpha-2 adrenergic agonist) increasingly found mixed into street drugs | Deep sedation, dangerously low blood pressure and heart rate, slowed breathing, and severe necrotic skin wounds with repeated use | No direct reversal agent; naloxone only treats any co-occurring opioid |
| Xylene | Petroleum-derived industrial solvent used in paints, glues, and printing | Headache, dizziness, nausea, and respiratory irritation; high exposure can cause unconsciousness or irregular heartbeat | No specific antidote; treatment is removal from exposure plus supportive care |
| Xylitol | Sugar-alcohol sweetener found in sugar-free gum, candy, and baked goods | Harmless to humans but triggers a rapid insulin surge in dogs, causing dangerous low blood sugar and possible liver failure | No antidote; treatment involves dextrose and liver support under veterinary care |
| Xylocaine (Lidocaine) | Local anesthetic used in medical and dental procedures | In overdose or accidental intravenous injection, can cause seizures, dangerous heart rhythms, and cardiac arrest | Intravenous lipid emulsion therapy |
| Xanthium (Cocklebur) | Toxin concentrated in the seeds and young seedlings of the cocklebur plant | Vomiting, weakness, and liver damage; can be fatal to grazing livestock and curious pets | No specific antidote; supportive veterinary treatment |
| Xanthotoxin (Methoxsalen) | Natural compound found in plants such as wild parsnip, celery, and figs | Causes severe burns, blistering, and dark skin discoloration on skin exposed to sunlight after contact | No antidote; avoid sun exposure and treat burns symptomatically |