Taking two Lexapro pills instead of one is unlikely to cause serious harm for most people, but it’s worth knowing what to watch for. The standard dose of Lexapro (escitalopram) is 10 mg per day, with a maximum recommended dose of 20 mg. So if you’re on 10 mg and accidentally doubled up, you’ve landed right at the FDA-approved ceiling. If you’re already on 20 mg, you’ve taken 40 mg, which is above the recommended range and deserves more attention.
Why a Single Double Dose Is Usually Manageable
Lexapro has a relatively wide margin between a therapeutic dose and a dangerous one. The maximum approved dose for adults is 20 mg per day, and clinical studies on overdose have looked at ingestions far higher than a simple double dose. A one-time jump to 20 mg (from a 10 mg prescription) falls within the range doctors sometimes prescribe intentionally. Your body will process the extra medication over the next day or two, since Lexapro has a half-life of about 27 to 32 hours. That means it takes roughly a day and a half for your body to clear just half the drug, so the effects of the extra dose will taper gradually rather than hitting all at once.
The most important thing is to resume your normal dose at your next scheduled time. Don’t skip a dose to “make up” for the extra one, as this can cause withdrawal-like symptoms that feel worse than the effects of doubling up.
Side Effects You Might Notice
With a double dose, you may feel an amplified version of common Lexapro side effects. These can include nausea, drowsiness, dizziness, or a mild headache. Some people feel jittery or restless. Others notice nothing different at all. The severity depends on your usual dose, your body weight, how long you’ve been on the medication, and whether you take anything else that affects serotonin levels.
If you’re on a 5 mg dose and took 10 mg, you’re well within standard prescribing range and are very unlikely to feel any difference. If you’re on 20 mg and took 40 mg, the chance of noticeable side effects goes up, though a single occurrence at this level is still not typically dangerous in an otherwise healthy adult.
When a Double Dose Becomes More Concerning
The risk increases significantly if you take other medications or supplements that also raise serotonin levels. Common ones include over-the-counter cough medicines containing dextromethorphan (found in many cold and flu products), the herbal supplement St. John’s wort, certain migraine medications, and other antidepressants. Combining a double dose of Lexapro with any of these raises the chance of serotonin toxicity, a condition where excess serotonin overstimulates the nervous system.
Serotonin toxicity exists on a spectrum from mild to severe. Mild symptoms include tremor, restlessness, and exaggerated reflexes. More serious signs include muscle rigidity, rapid heart rate, heavy sweating, agitation, and confusion. In a study of 46 escitalopram-only overdoses, serotonin toxicity occurred in about 15% of cases, and the most common signs were exaggerated reflexes and involuntary muscle jerking. These were overdoses well beyond a double dose, but the pattern is worth knowing.
Heart rhythm changes are another concern at higher doses. Lexapro can lengthen the QT interval, a measure of how your heart’s electrical system resets between beats. At 10 mg per day, this effect is small (about 4 milliseconds). At 30 mg per day, it roughly doubles to about 11 milliseconds. A single double dose is unlikely to cause a clinically meaningful change, but people with existing heart conditions or those taking other QT-prolonging medications face higher risk. Symptoms of a heart rhythm problem include feeling your heart race or flutter, dizziness, or fainting.
What To Do Right Now
If you took a double dose and feel fine, the most practical step is to note what happened and return to your regular schedule. You don’t need to take a half dose tomorrow or adjust your timing.
If you’re experiencing symptoms like significant nausea, rapid heartbeat, tremor, muscle twitching, or unusual agitation, contact Poison Control at 1-800-222-1222. They provide free, confidential guidance 24 hours a day and can tell you whether your specific situation (based on your dose, other medications, and symptoms) needs medical evaluation. You can also use their online tool at poison.org.
Seek emergency care if you develop severe symptoms: confusion, high fever, muscle rigidity, seizures, or fainting. These would suggest a serious reaction, though they are rare with a single accidental double dose taken alone.
Preventing It From Happening Again
Accidentally doubling a dose is one of the most common medication errors. It usually happens when you can’t remember whether you already took your pill. A few simple strategies help: use a weekly pill organizer so you can see at a glance whether today’s dose is gone, set a daily phone alarm tied to the act of taking your pill (not just a reminder to take it later), or keep a brief log where you check off each dose. If you use a pill organizer and find today’s compartment already empty, you can trust that you’ve taken it and avoid the guesswork that leads to doubling up.