Combined pill side effects

Some people also notice mood changes or bloating. These effects may settle as the body adjusts, but persistent or troublesome symptoms deserve a medication review.

The pill contains an oestrogen and a progestogen. These hormones suppress ovulation and alter the womb lining, so spotting, lighter withdrawal bleeding or missed bleeding can occur.

A symptom beginning after a new pill is not automatically caused by it. Migraine history, other medicines, pregnancy and unrelated illness can change the interpretation, so the timing and pattern matter.

Take each tablet at a consistent time and follow the packet instructions. Note when headaches, bleeding or nausea occur, and record missed tablets or new medicines so a clinician can spot a pattern.

Do not stop mid-pack without checking how this affects contraceptive protection. A pharmacist or prescribing clinician can discuss whether a different formulation or another contraceptive method fits better.

Get urgent medical help for sudden chest pain, breathlessness, coughing blood, one-sided leg pain or swelling, sudden weakness, difficulty speaking, or a new severe headache with visual disturbance.

Arrange prompt advice for very heavy bleeding, severe abdominal pain, yellowing of the skin or eyes, a possible pregnancy, or headaches that are new, worsening or accompanied by neurological symptoms.

Ask whether your symptom pattern suggests changing the pill, whether migraine, smoking, blood pressure or clot history changes your options, and what to do if you miss tablets or vomit after a dose.