Like many plants in the Solanum genus, all parts of solanum japonense are toxic when ingested due to the presence of glycoalkaloids (particularly solanine). Symptoms of poisoning affect the gastrointestinal and neurological systems. These symptoms include nausea, diarrhea, vomiting, headache, dizziness, thyroid problems, itching, and eczema. In more severe cases, symptoms include fever, paralysis, hypothermia, and even death. It is not known how concentrated these toxins are in solanum japonense, but it is best to be cautious and avoid ingesting this or similar plants.