Using anti-sickness drugs during pregnancy

Do not stop a prescribed medicine or start a pharmacy, herbal or borrowed product without checking. Untreated vomiting can also cause harm through dehydration, poor nutrition and missed doses of essential treatment.

The decision considers the stage of pregnancy, likely cause and severity of sickness, previous response, medical conditions and all other medicines. When nausea is related to cancer therapy, the obstetric and oncology teams may coordinate the timing and combination of anti-sickness treatment.

Different medicines act on different nausea pathways. Possible effects include sleepiness, constipation, restlessness, headache or changes in heart rhythm, so a familiar brand is not automatically appropriate in a new pregnancy or alongside cancer treatment.

Tell the prescriber how often you vomit, whether liquids stay down, when you last passed urine and whether tablets are being lost after dosing. Provide a complete list of cancer medicines, pain relief, supplements and products bought without a prescription.

Take the selected medicine at the advised time; some options work better before nausea becomes severe. Sip fluids regularly if tolerated and discuss nutrition support if eating is difficult. If you vomit after taking an important dose, call for instructions instead of repeating it automatically.

Contact your maternity or oncology team urgently if you cannot keep fluids down, are passing very little urine, feel faint, have a racing heartbeat, lose weight, or cannot retain prescribed cancer or pregnancy medicines. These features can indicate dehydration or the need for treatment by another route.

Seek emergency care for vomiting with blood, severe abdominal pain, chest pain, breathing difficulty, confusion, collapse, a seizure, or swelling of the face or throat. New severe headache, visual disturbance or sudden swelling during pregnancy also requires urgent assessment.

Ask what is most likely causing the nausea, why the proposed medicine fits this stage of pregnancy, how it interacts with cancer therapy, and which side effects need a call. Confirm who coordinates prescriptions and what to do outside clinic hours if doses will not stay down.