How Does Citalopram Make You Feel At First? Expert Tips

Starting citalopram often feels like a bumpy ride before it smooths out. In the first one to two weeks, many people experience nausea, fatigue, headache, or increased anxiety before any mood improvement appears. These initial side effects are common and usually fade, but the first few days can be uncomfortable enough that knowing what to expect makes a real difference.

What Does the First Week on Citalopram Actually Feel Like?

The first week is typically the hardest part of starting citalopram. Your brain is adjusting to higher levels of serotonin, and that adjustment process creates physical and emotional symptoms that can feel worse than the depression or anxiety you are treating.

Most people describe a feeling of being “wired but tired.” You may feel restless and jittery while simultaneously exhausted. Some people report feeling emotionally flat or numb, while others feel more anxious than before. Both responses are normal during the adjustment period and do not predict how the medication will work long-term.

The physical symptoms are often the most noticeable. Nausea is the most common early side effect, affecting a significant number of people in the first week. Headaches, dizziness, and a strange “brain zaps” sensation can also occur. Sweating, especially at night, is another frequent complaint. These symptoms typically peak around day three to five and begin to ease by the end of week one.

How Long Until Citalopram Starts Working?

Citalopram does not work immediately. The medication takes time to change how your brain processes serotonin, and that change happens gradually over several weeks.

Some people notice a small improvement in sleep or appetite within the first week. This is not the antidepressant effect yet — it is likely a sedative effect or a reduction in physical anxiety symptoms. The actual mood-lifting effect usually begins between two and four weeks. Full therapeutic benefit typically takes six to eight weeks.

This timeline matters because many people stop taking citalopram in the first two weeks, thinking it is not working. The early side effects are often mistaken for the medication making things worse. If you can tolerate the first two weeks, the odds of experiencing meaningful improvement increase substantially.

It is also important to understand that “working” does not mean feeling happy. It means feeling less burdened. The noise in your head quiets. The heaviness in your chest lightens. The change is often subtle — you may not notice it yourself, but people around you might comment that you seem more like your old self.

Why Does Citalopram Make Anxiety Worse Before It Gets Better?

This is one of the most common and most distressing early experiences with citalopram. The medication increases serotonin activity in the brain, but in the first days, this increase can overstimulate certain neural pathways before the brain adapts.

Serotonin is not just a “feel-good” chemical. It is involved in regulating arousal, fear responses, and sensory processing. When serotonin levels rise suddenly, some people experience a temporary spike in anxiety, restlessness, or agitation. This is sometimes called “activation” or “jitteriness.”

This increased anxiety is usually mild to moderate and typically resolves within one to two weeks. However, for people with panic disorder, the early increase in anxiety can be more intense. Some clinicians recommend starting at a lower dose for people with panic disorder specifically to minimize this effect.

If the increased anxiety is severe, persistent, or accompanied by thoughts of harming yourself, contact your prescriber immediately. Do not stop the medication abruptly without medical guidance, as sudden withdrawal can cause its own set of symptoms.

What Are the Most Common Side Effects in the First Few Weeks?

The early side effects of citalopram are predictable because they are directly related to increased serotonin activity in the body. Serotonin is not only in the brain — it is also in the gut, blood vessels, and other tissues.

Common early side effects include:

• Nausea and digestive upset — the most common early side effect, usually improves within one to two weeks
• Headache — typically mild and resolves as the body adjusts
• Fatigue or drowsiness — more common in the first week, often improves with time
• Insomnia or vivid dreams — some people feel more alert at night
• Increased sweating — especially at night, can persist longer than other side effects
• Dry mouth — often improves but may persist
• Dizziness or lightheadedness — usually mild and temporary
• Changes in appetite — either increased or decreased
• Sexual side effects — delayed ejaculation, reduced libido, or difficulty reaching orgasm

Most of these side effects are mild and fade within two to four weeks. Sexual side effects are the exception — they often do not improve and may persist as long as you take the medication. This is a common reason people stop citalopram even when it works well for their mood.

Serious side effects are rare but require immediate medical attention. These include signs of serotonin syndrome — severe agitation, confusion, rapid heart rate, muscle twitching, and fever — as well as any signs of an allergic reaction such as rash, swelling, or difficulty breathing.

Tips to Manage the First Few Weeks on Citalopram

Taking citalopram with food can significantly reduce nausea. A small meal or snack before your dose is often enough. Some people find taking it at bedtime helps them sleep through the worst of the side effects, while others find it causes insomnia and prefer to take it in the morning. Your prescriber can help you decide which timing works best for you.

Stay hydrated. Headaches and dizziness are often worse when you are dehydrated, and citalopram can increase sweating. Drinking water throughout the day helps.

Reduce caffeine. Citalopram can amplify the jittery feeling caffeine produces. If you drink coffee or energy drinks, consider cutting back during the first few weeks.

Do not drink alcohol. Alcohol interacts with citalopram and can increase sedation, impair judgment, and worsen anxiety. The combination is not recommended, especially during the adjustment period.

Be patient with yourself. The first two weeks are the hardest, and it is normal to feel worse before you feel better. Give the medication a fair trial of at least six to eight weeks before deciding whether it works for you.

Keep a simple log of your mood and side effects each day. This helps you see patterns over time and gives your prescriber useful information. Many people find that looking back at their log after three weeks shows gradual improvement they did not notice day to day.

When to Contact Your Doctor

Some symptoms require immediate medical attention. If you experience thoughts of suicide, new or worsening depression, severe agitation, or impulsive behavior in the first weeks, contact your prescriber or seek emergency care. Young adults under age 25 may have a higher risk of increased suicidal thinking when starting antidepressants, and this risk is highest in the first few weeks.

Contact your doctor if side effects are severe or do not improve after two weeks. Nausea that prevents eating, headaches that do not respond to over-the-counter pain relief, or insomnia that leaves you exhausted during the day are all worth discussing. Your doctor may adjust the dose, change the timing, or switch you to a different medication.

Do not stop citalopram suddenly without medical supervision. Stopping abruptly can cause withdrawal symptoms including dizziness, nausea, headache, irritability, and electric-shock sensations. If you and your doctor decide to stop, the dose is usually tapered gradually over several weeks.