Sounds like 'Sit-al-oh-pram'

Citalopram is used to treat depression. Find out how to take it safely and possible side effects.

What is citalopram?

Citalopram is a  type of antidepressant known as a selective serotonin reuptake inhibitor (SSRI). SSRIs are the most frequently prescribed antidepressants.

Citalopram is used to treat depression. It is believed to work by increasing the levels of a chemical called serotonin which can help lift your mood. You should also notice that you sleep better and feel more relaxed.

Read more about antidepressants and SSRIs.


In Aotearoa New Zealand citalopram is available as tablets (20 mg)

  • The usual dose of citalopram is 10 or 20 mg once a day.
  • Your doctor will usually start you on a low dose and if you need to, will increase your dose slowly after a few weeks. This allows your body to get used to the medicine and reduces side effects.
  • Always take your citalopram exactly as your doctor has told you. The pharmacy label on your medicine will tell you how much citalopram to take, how often to take it, and any special instructions.

How to take citalopram

  • Take citalopram once a day, in the morning OR the evening. Take your dose at the same time each day. 
  • You can take citalopram with or without food but if you think it is upsetting your stomach, try taking it with food.
  • Missed dose: If you forget to take your dose, take it as soon as you remember that day. But, if it is nearly time for your next dose, just take the next dose at the right time. Do not take double the dose.
  • Keep taking citalopram every day. It may take 4 to 6 weeks before you notice the full benefits of citalopram and you should start to feel better after 1 to 2 weeks. Some people feel worse in the first few weeks before they feel better. Citalopram needed for at least a few months and your doctor will tell you how long to take it for.

Things to consider while you are taking citalopram

Diabetes: if you have diabetes, you may need to check your blood glucose more often because citalopram can affect the levels of glucose in your blood.

Interactions with other medicines and herbal supplements: Citalopram can interact with some medications (including anticoagulants and NSAIDs), herbal supplements (such as St John's Wort), and recreational drugs, so check with your doctor or pharmacist before starting citalopram and before starting any new products.

Possible side effects of citalopram

Like all medicines, citalopram can cause side effects, although not everyone gets them. Often side effects improve as your body gets used to the new medicine.

Side effects What should I do?
  • Nausea (feeling sick)
  • Vomiting (being sick)
  • Headache
  • Dry mouth
  • Increased sweating
  • Diarrhoea (runny poos)
  • This is quite common when you first start citalopram
  • If you have nausea, try taking your dose with food.
  • For headaches, stay hydrated and take paracetamol.
  • Read about how to treat diarrhoea or dry mouth.
  • Difficulty falling asleep
  • This is quite common. Try taking your dose in the morning.
  • Feeling sleepy, drowsy, dizzy or tired
  • Difficulty concentrating
  • These are quite common. 
  • Try taking your dose in the evening
  • Be careful when driving or using tools until you know how this medicine affects you
  • Avoid drinking alcohol. Read more about how alcohol affects medicines.
  • Feeling less or more hungry than usual
  • This is common but tell your doctor if they cause you problems.
  • Changes in weight (increase or decrease)
  • This is common but tell your doctor if they cause you problems.
  • Loss of sex drive or libido
  • Problems with keeping an erection or ejaculation
  • Some vaginal bleeding
  • These are common at the start of treatment but tell your doctor if they cause you problems or if they are severe.
  • The good effects of the SSRI may, after a while, improve your sex life as your mood lifts and you become interested in life and relationships again.
  • Read more about medicines and sexual problems.
  • Signs of low sodium such as dizziness, confusion, agitation, cramps, unsteadiness, feeling faint or tired.
  • This is common especially in the elderly, women, people who are also taking diuretics (water tablets) or omeprazole and people with low body weight
  • Let your doctor know if you get these symptoms.
  • Suicidal feelings or behaviour such as agitation, aggression, self-harm, worsening of low mood.
  • These are rare but serious side effects
  • They are most likely to happen during the start of treatment or when doses are changed
  • Contact your doctor immediately
  • For urgent help contact Healthline 0800 611 116 or Lifeline 0800 543 354 (available 24/7).
  • Signs of serotonin syndrome such as feeling agitated and restless, heavy sweating, shivering, fast heart rate or irregular heartbeat, headache, diarrhoea and rigid or twitching muscles.
  • These are rare but serious side effects
  • You are at increased risk of serotonin syndrome if you just started taking the SSRI or increased the dose or started other medicines that can cause serotonin syndrome
  • Tell your doctor immediately or ring HealthLine 0800 611 116
Did you know that you can report a side effect to a medicine to CARM (Centre for Adverse Reactions Monitoring)? Report a side effect to a product

Learn more

The following links provide further information on citalopram.

Citalopram Patient Information  (Māori) NZ Formulary, NZ
Citalopram (PSM) Medsafe Consumer Information Sheet, NZ


  1. Citalopram NZ Formulary, NZ 2022
  2. Selective serotonin re-uptake inhibitors NZ Formulary, NZ 2022
  3. The role of medicines in the management of depression in primary care BPAC, NZ 2017
  4. Sexual Dysfunction Associated with Antidepressants and Antipsychotics Medsafe, NZ 2015

Additional resources for healthcare professionals

Citalopram (PSM) Medsafe Product Information, NZ
Reminder – citalopram and QT prolongation Medsafe, NZ, 2015
Citalopram and escitalopram – same but different handout SafeRx, Waitemata, NZ, 2019

Credits: Sandra Ponen, Pharmacist. Reviewed By: Angela Lambie, Pharmacist, Auckland Last reviewed: 14 Feb 2018