Drugs administered to treat the side effects of nausea, and vomiting are mostly ineffective. However, there are reports that state that THC, taken in a capsule or in a cigarette, does reduce nausea and vomiting. The controversy is that some patients experienced hallucinations while taking the drug. The hallucinations were experienced perhaps because too much of the drug was taken at one time. First, the way the drug is taken varies on the individual.
Some people react differently to all kinds of drugs taken orally.
After deciding on how the patient should orally take the drug, the person administering the drug must keep in mind other considerations. First, the drug must be given early enough to prevent anticipatory vomiting. This is a well known phenomenon in cancer patients. That is chemotherapy patients expect to vomit and in anticipation of it, they begin vomiting before the treatment even begins. Another consideration of administering the drug is blood concentration level.