In their absence, you are left with some management principles. If the patient is still conscious, limiting the absorption of the poison from the gastrointestinal tract is the prime goal of field management. If vomiting can be induced early, within one hour, it may be very beneficial, especially when a mushroom poisoning is suspected. Emetics are vomiting-inducers. A lightweight emetic for your first aid kit is a small bottle of syrup of ipecac.
Younger people get one tablespoon with the same amount of water.
Do not sit facing them. The vomit tends to come suddenly and forcefully, and may repeat several times. If they haven't vomited in 20 minutes, repeat the dose. Without ipecac, stimulation of the gag reflex may work to induce vomiting. Lean the patient forward, gently reach into their mouth with a finger, and tickle the back of their throat.