Citalopram Oral Tablet Side Effects: What to Do About Them

What is citalopram, and why do side effects happen?

Citalopram is a selective serotonin reuptake inhibitor, or SSRI. It is commonly prescribed for depression and is sometimes used in other situations when a clinician believes it may help. SSRIs work by increasing serotonin activity in the brain. That can improve mood over time, but serotonin also affects sleep, digestion, sweating, sexual function, and other body systems. In other words, when brain chemistry changes, the rest of the body sometimes sends feedback. Loudly.

Common citalopram side effects

The most commonly reported side effects with citalopram oral tablets include nausea, dry mouth, drowsiness, insomnia, increased sweating, tremor, diarrhea, fatigue, restlessness, and sexual side effects. Some people notice only one or two. Others get the full sampler platter.

Nausea, diarrhea, and upset stomach

Digestive side effects are very common when starting citalopram. Nausea is one of the biggest complaints, and some people also notice diarrhea, vomiting, or general stomach discomfort.

• Try taking citalopram with food unless your prescriber told you otherwise.
• Eat smaller, blander meals for a few days if your stomach feels touchy.
• Stay hydrated, especially if diarrhea or vomiting shows up.
• If nausea is severe, lasts more than a couple of weeks, or makes it hard to eat or drink, contact your prescriber.

For many people, stomach side effects improve within the first week or two. If they do not, your clinician may suggest adjusting the dose, the timing, or the medication itself.

Drowsiness, fatigue, and brain-fog vibes

Citalopram can make some people sleepy, especially early on. Others describe it as feeling slightly slowed down or mentally padded in bubble wrap.

• If it makes you sleepy, ask your doctor whether taking it in the evening makes sense.
• Avoid driving, operating machinery, or doing anything risky until you know how it affects you.
• Be careful with alcohol, which can make sedation worse.

If the fatigue is intense, lingers, or interferes with work and daily life, bring it up. Sometimes the dose needs adjusting. Sometimes the timing does. Sometimes your body just needs a little longer to get the memo.

Insomnia, nervousness, and feeling a little “too switched on”

While citalopram makes some people drowsy, it can make others feel restless, jittery, or more alert than usual. Trouble falling asleep, tossing around at 2 a.m., and feeling vaguely revved up can happen early in treatment.

• If it keeps you awake, ask whether a morning dose may be better.
• Cut back on late-day caffeine while your body is adjusting.
• Keep a regular sleep schedule, even if your brain wants to freelance.
• Tell your clinician if you feel intensely agitated, panicky, or dramatically more anxious.

Dry mouth and increased sweating

Dry mouth is common and surprisingly annoying. Increased sweating is common and surprisingly rude.

• Sip water regularly.
• Try sugar-free gum or lozenges for dry mouth.
• Be mindful of dental hygiene if dry mouth sticks around.
• Wear breathable clothing if sweating becomes bothersome.

These side effects are often manageable, but if they are making daily life miserable, it is worth mentioning them at your next appointment.

Tremor, headache, and mild shakiness

A mild tremor, headache, or subtle internal shakiness can occur when starting an SSRI. Often this is temporary. If the shaking is strong, worsening, or paired with fever, confusion, or muscle stiffness, that is a different story and could suggest something more serious.

Sexual side effects

This is the side effect people often want to whisper about, but it deserves plain English. Citalopram can lower sex drive, delay orgasm, make orgasm harder to reach, and in some men contribute to erectile or ejaculation problems. Unlike nausea or mild sleep changes, sexual side effects may not fade quickly and can persist while the medication is continued.

• Bring it up with your prescriber. Seriously. This is common, and clinicians hear about it all the time.
• Do not stop citalopram on your own because of sexual side effects.
• Your clinician may discuss dose changes, timing changes, or whether a different antidepressant might be a better fit.

Serious citalopram side effects that need prompt attention

Suicidal thoughts or worsening depression

Antidepressants including citalopram carry a warning about suicidal thoughts and behaviors in children, adolescents, and young adults. Risk is especially watched during the first few months of treatment and when the dose changes. That does not mean citalopram causes this in everyone, but it does mean new or worsening mood symptoms should never be brushed off.

Call your doctor right away if you notice:

• worsening depression
• new agitation, panic, or extreme irritability
• impulsive or risky behavior
• suicidal thoughts or talk of self-harm

If there is any immediate safety concern, call 911 or go to the nearest emergency room.

Serotonin syndrome

Serotonin syndrome is uncommon but potentially dangerous. It can happen when serotonin levels get too high, especially if citalopram is combined with other serotonergic drugs or certain supplements. Warning signs can include fever, sweating, confusion, agitation, a fast heartbeat, diarrhea, muscle stiffness, twitching, shivering, or loss of coordination.

This is not a “wait and see next week” situation. Seek urgent medical care if these symptoms appear, especially after starting citalopram, increasing the dose, or adding another medication such as some migraine drugs, tramadol, amphetamines, lithium, linezolid, or St. John’s wort.

Abnormal heart rhythm and QT prolongation

Citalopram has a known dose-related risk of QT prolongation, which is a heart rhythm problem that can, in rare cases, become dangerous. Risk may be higher at doses above 40 mg per day, in people over age 60 who need lower maximum doses, in people with low potassium or magnesium, in some liver conditions, and in people taking certain interacting medications.

Get medical help right away if you develop:

• fainting
• chest pain
• shortness of breath
• heart palpitations
• severe dizziness

If you have a history of heart problems, let your clinician know before starting treatment. In some cases, they may recommend an ECG or lab testing.

Low sodium levels, also called hyponatremia

SSRIs including citalopram can sometimes cause low sodium levels, especially in older adults, people taking diuretics, or people who are already volume-depleted. Mild symptoms can include headache, trouble concentrating, weakness, memory problems, or feeling unsteady. Severe symptoms can include confusion, hallucinations, fainting, or seizures.

If you feel mentally foggy in a new and alarming way, unusually weak, or off-balance, call your clinician. If confusion or seizures occur, get emergency care.

Increased bleeding risk

Citalopram can increase bleeding risk, especially when combined with aspirin, ibuprofen, naproxen, warfarin, or other blood thinners and antiplatelet drugs. Easy bruising, frequent nosebleeds, bleeding gums, or black or bloody stools deserve medical attention.

Do not assume every over-the-counter pain reliever is harmless. Ask your clinician or pharmacist what is safest for you.

Mania or hypomania

In people with bipolar disorder, an antidepressant can sometimes trigger mania or hypomania. Signs may include needing very little sleep, feeling unusually invincible, racing thoughts, nonstop talking, or impulsive behavior that is way out of character. If that happens, contact your doctor promptly.

Angle-closure glaucoma

Citalopram can rarely trigger angle-closure glaucoma in people with certain eye anatomy. Sudden eye pain, vision changes, halos around lights, swelling, or redness around the eye should be treated as urgent.

What to do about citalopram side effects

If side effects show up, resist the urge to play pharmacist, chemist, and life coach all at once. Start here instead:

1. Do not stop the medication abruptly. Suddenly stopping citalopram can cause discontinuation symptoms such as dizziness, nausea, headache, sleep problems, irritability, and flu-like feelings.
2. Track what you are feeling. Write down when the side effect started, how severe it is, and whether it changed after meals, dose timing, or sleep.
3. Ask about dose timing. Morning may work better for insomnia or jitteriness. Evening may work better for drowsiness.
4. Take it exactly as prescribed. More is not better. Less is not automatically safer.
5. Review other medications and supplements. Interactions matter with citalopram, especially anything that affects serotonin, bleeding risk, or heart rhythm.
6. Call your doctor if side effects are severe, persistent, or affecting your quality of life. A small adjustment can sometimes make a big difference.

How long do citalopram side effects last?

Many common side effects improve within the first one to two weeks, though some people need longer. Sexual side effects may last longer and do not always improve with time. Mood benefits, meanwhile, often take several weeks to become more noticeable. This mismatch can be frustrating: your stomach may complain on day three while your mood is still waiting for the opening act to finish.

If side effects are worsening instead of improving, or if they are intense enough to make you want to quit the medication, call your prescriber before making any changes.

What not to do

• Do not suddenly stop citalopram unless a clinician tells you to.
• Do not double up after a missed dose unless you were specifically instructed to do that.
• Do not mix in supplements or new medications casually, especially St. John’s wort or other products that affect serotonin.
• Do not ignore chest pain, fainting, confusion, seizures, or suicidal thoughts.
• Do not be embarrassed to mention sexual side effects, sleep problems, or sweating. None of those are “too small” to discuss.

Experiences people commonly describe with citalopram side effects

People’s experiences with citalopram oral tablets vary a lot, but certain patterns come up again and again. One common experience is the “rough start, calmer finish” pattern. Someone begins the medication and spends the first several days feeling a little nauseated, a little sleepy, and maybe a little annoyed that the promised improvement has not arrived on schedule. Then, after a week or two, the stomach issues fade, the sleep pattern settles down, and the medication becomes much easier to tolerate. For these people, the early side effects feel like a temporary toll booth on the road to feeling better.

Another common experience is mixed signals. A person may feel tired during the day but restless at night. They may notice their mind is quieter, yet their body feels slightly jittery. That contradiction can be confusing. It does not always mean the medication is wrong for them, but it is worth tracking and discussing. Sometimes a change in dose timing helps. Sometimes the starting dose was simply the body’s least favorite surprise party.

Sexual side effects are another experience people frequently describe, though many bring it up only after weeks of frustration. Someone may feel emotionally more stable on citalopram but notice lower libido or difficulty reaching orgasm. That can create a very real quality-of-life issue, especially when the medication is otherwise working well. A lot of patients feel relieved once they learn this is a recognized medication effect and not a personal failure, a relationship problem, or proof that something is permanently broken.

Some people also describe a strong adjustment period whenever the dose is increased. They may be doing fine on one dose, then notice nausea, sweating, shakiness, or sleep disruption after a dosage change. In many cases, those symptoms settle again, but the change can feel discouraging in the moment. It helps to know that the “re-adjustment” phase is a real thing and not just bad luck showing off.

There are also people who notice warning signs early and do exactly the right thing by getting help. A person might develop severe dizziness, palpitations, agitation, confusion, or new suicidal thoughts and recognize that these are not side effects to tough out alone. Reaching out quickly can prevent a dangerous situation from getting worse. This is an important part of the citalopram story too: side effects are not just something to endure. They are information. Sometimes they say, “Hang in there, I’ll pass.” Sometimes they say, “Call your doctor today.” And sometimes they say, “Please go get urgent care now.”

The most useful takeaway from real-world experiences is simple: side effects deserve attention, not panic. Many are manageable. Some need a treatment adjustment. A few are emergencies. The best outcomes usually happen when patients keep an honest symptom log, speak up early, and treat follow-up with their prescriber like part of the treatment itself rather than an optional bonus level.

Final thoughts

Citalopram oral tablet side effects can range from mildly annoying to medically urgent. The most common problems, such as nausea, dry mouth, sleep changes, sweating, fatigue, and sexual side effects, are often manageable and may improve with time. The serious ones, including suicidal thoughts, serotonin syndrome, dangerous heart rhythm changes, hyponatremia, bleeding, mania, and acute eye symptoms, should never be ignored.

The smartest move is not to guess your way through it. If something feels off, especially after starting treatment or changing your dose, check in with your prescriber. Managing side effects well is not a sign the medication failed. It is part of using it safely and effectively.

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