Anti-emetic drugs can be given in different ways.
Some tablets can be swallowed with plenty of water, while others can be placed under the tongue (sublingually) to dissolve.
Into a vein
Some anti-emetics can be diluted in a fluid and given as an injection into the vein or by a drip into the vein (intravenous infusion). The drugs will be given through either a small tube (cannula) in your hand or arm, or a larger tube into a vein in the chest (central line) or the crook of your arm (PICC line).
Into the muscle
The drugs are given by injection into a muscle (intramuscular injection).
Under the skin (subcutaneously)
The drugs can either be injected into the fatty tissue under the skin, using a small needle and syringe, or given slowly over several hours, using a pump attached to a small needle that is placed just under the skin.
These are put into the back passage (rectum), where they dissolve and are absorbed into the bloodstream through the lining of the gut.
Some anti-emetic drugs can be absorbed through the skin (transdermally) from a small patch that is stuck onto the skin like a plaster. The patch is usually changed every couple of days.
Some cancer treatments, including certain chemotherapy drugs, are known to cause nausea and vomiting. If you are taking these drugs, you will be given anti-emetic therapy before the treatment starts. It may also be continued for a few days after the treatment has finished.
When someone feels sick or nauseated because of the cancer itself, it can take a while to control this distressing symptom. You will be given anti-emetics and, if possible, the cause of the sickness will be treated.
It's often easier to control nausea and prevent vomiting if you take the anti-emetics regularly, rather than once the nausea has built up. If you have any nausea or vomiting that is new, becomes worse or lasts for more than a few days, let your doctor or nurse know.