Medications, explained simply
A visual guide to the medications we may discuss together. No jargon, no judgment, just a clear picture of what each one does and how they differ.
SSRIs
SSRI stands for selective serotonin reuptake inhibitor. SSRIs are the most commonly prescribed medications for depression and anxiety. They work by making more serotonin available in the brain areas that regulate mood, worry, and stress. They are not tranquilizers and they are not habit forming. Most are taken once daily, and they usually take a few weeks to show their full benefit.
Fluoxetine
Brand name: ProzacWhat makes it different
The longest lasting SSRI by far. Because it stays in the body for days, missing a single dose is less of a problem, and it tends to cause the fewest withdrawal like symptoms when stopped. Often described as more activating, so it is usually taken in the morning.
How it works
It increases serotonin availability in the brain by blocking its reabsorption into nerve cells.
- Takes 4 to 6 weeks for full effect.
- Because it lingers so long, it also takes longer to fully clear the body if you ever switch medications.
Sertraline
Brand name: ZoloftWhat makes it different
One of the most widely prescribed antidepressants in the world. It has a milder effect on liver enzymes than several other SSRIs, which means fewer interactions with other medications. Dosing is flexible, and it is commonly used for depression, anxiety, PTSD, OCD, and panic.
How it works
It raises serotonin levels in the brain by blocking the reabsorption of serotonin.
- Usually taken once daily, with or without food.
- Nausea in the first week or two is common and often fades on its own.
Paroxetine
Brand name: PaxilWhat makes it different
Among the most calming of the SSRIs, but also more likely to cause dry mouth, constipation, and weight gain. It is one of the hardest antidepressants to stop: missing doses or stopping suddenly is more likely to cause discontinuation symptoms such as dizziness and vivid dreams, so it needs a slow taper guided by your prescriber.
How it works
It increases serotonin in the brain by blocking its reuptake, with added calming effects compared with other SSRIs.
- Often taken at bedtime because it can be calming.
- Do not stop it suddenly.
Citalopram
Brand name: CelexaWhat makes it different
A straightforward once daily SSRI often chosen for simple dosing. It has a maximum recommended daily dose because higher doses can affect the heart rhythm, so your prescriber will keep the dose within a safe range.
How it works
It increases serotonin availability in the brain by blocking its reabsorption.
- Tell your prescriber about any heart rhythm history.
- Like all SSRIs, it takes weeks to reach full effect.
Escitalopram
Brand name: LexaproWhat makes it different
Closely related to citalopram. It is the active mirror image half of the citalopram molecule, refined into its own medication. Often described as well tolerated, and it is widely used for both depression and generalized anxiety.
How it works
It blocks serotonin reabsorption, increasing serotonin signaling in mood and anxiety circuits.
- Once daily dosing.
- Early side effects such as nausea or headache often ease within the first two weeks.
Fluvoxamine
Brand name: LuvoxWhat makes it different
The SSRI most associated with OCD treatment. It leaves the body faster than the other SSRIs, so consistent daily timing matters more. It strongly slows the breakdown of caffeine, so coffee and energy drinks can feel much stronger while taking it.
How it works
It increases serotonin in the brain by blocking its reuptake.
- Do not double up after a missed dose; ask your prescriber what to do.
- Cutting back on caffeine during the first weeks is often wise.
SNRIs
SNRI stands for serotonin norepinephrine reuptake inhibitor. SNRIs work on serotonin like SSRIs do, and also on norepinephrine, a brain chemical involved in energy, focus, and the way the body handles pain and stress. That second action is why some SNRIs also help with chronic pain, fibromyalgia, and nerve pain. Like SSRIs, they take weeks to reach full effect and should not be stopped suddenly.
Venlafaxine
Brand name: Effexor XRWhat makes it different
Acts mostly on serotonin at lower doses and adds meaningful norepinephrine action as the dose goes up, which is why dose changes can feel like a different medication. The extended release form is taken once daily. Missing doses can bring on discontinuation symptoms quickly because the base drug clears the body fast.
How it works
It increases both serotonin and norepinephrine availability by blocking their reabsorption, with the norepinephrine effect growing at higher doses.
- Take it at the same time each day.
- A slow taper is important when stopping.
Duloxetine
Brand name: CymbaltaWhat makes it different
The SNRI best known for pulling double duty. It treats depression and anxiety and is also FDA approved for diabetic nerve pain, fibromyalgia, and chronic muscle and joint pain. A common choice when mood symptoms and physical pain show up together.
How it works
It raises serotonin and norepinephrine levels by blocking their reuptake, which helps both mood circuits and pain signaling.
- Taking it with food can ease early nausea.
- Do not stop it suddenly; discontinuation symptoms are common without a taper.
Desvenlafaxine
Brand name: PristiqWhat makes it different
This is the active form your body converts venlafaxine into, packaged as its own medication. Because there is no conversion step, blood levels are steadier from day to day, and it has fewer drug interaction concerns. Once daily dosing.
How it works
It increases serotonin and norepinephrine availability by blocking their reuptake.
- The tablet has a special coating, so you may notice the empty shell in your stool. That is normal and does not mean the medicine did not work.
Levomilnacipran
Brand name: FetzimaWhat makes it different
The most norepinephrine leaning of the SNRIs, which can help energy and focus but also means blood pressure and heart rate should be monitored. Often considered when low energy and poor concentration are the main complaints.
How it works
It blocks the reuptake of norepinephrine more strongly than serotonin, raising both with an emphasis on norepinephrine.
- Once daily.
- Tell your prescriber if you have high blood pressure or a heart condition.
Milnacipran
Brand name: SavellaWhat makes it different
Unique on this list. In the US it is FDA approved for fibromyalgia, not for depression. It balances serotonin and norepinephrine more evenly than the others, and the norepinephrine action is thought to help with how the brain processes pain.
How it works
It blocks the reuptake of both serotonin and norepinephrine in roughly balanced fashion.
- Usually taken more than once a day because it clears relatively quickly.
- Nausea and headache are most common early on.
Anxiety medications
For anxiety, some medications are taken every day to keep baseline worry lower over time, while others are taken only as needed in the moment. Daily medications build up gradually and work in the background. As needed medications work within an hour or so for a specific situation, such as a panic surge or a stressful event, and then wear off. Neither type is meant to sedate you into feeling nothing. The goal is to take the edge off so you can use the coping tools that actually move you forward.
Taken only when needed
Used for a specific moment of anxiety or panic. Works within about an hour, then wears off. Not taken on a schedule.
Taken every day
Builds up gradually over weeks to lower baseline worry in the background. Will not help a panic surge in the moment.
Hydroxyzine
Brand names: Atarax, VistarilWhat it is used for
Short term relief of anxiety and tension, taken only when needed.
How it works
It blocks histamine, a brain chemical involved in alertness, which produces a calming effect.
- Not habit forming and not a controlled substance.
- It can cause drowsiness, so avoid driving until you know how it affects you, and avoid alcohol.
Propranolol
Brand name: InderalWhat it is used for
The physical symptoms of anxiety: racing heart, trembling hands, sweating. Commonly used for situational anxiety such as public speaking or performances. It does not calm worried thoughts directly; it quiets the body, which often quiets the mind in turn.
How it works
It blocks adrenaline receptors, slowing the heart rate and blunting the physical stress response.
- Meant for specific moments rather than daily use. Not habit forming.
- People with asthma or certain heart conditions need prescriber guidance before using it.
Buspirone
Brand name: BuSparWhat it is used for
Generalized anxiety as a daily medication. It is not an as needed medication and will not help a panic surge in the moment.
How it works
It acts on serotonin receptors involved in anxiety, gradually lowering baseline worry over time with regular use.
- Takes 2 to 4 weeks of consistent daily use to reach full effect.
- Not habit forming and not a controlled substance. It works best taken at the same times each day.
Other antidepressants
Not every antidepressant works on serotonin first. These two take different paths, which is exactly why they help people who did not click with an SSRI or SNRI.
Bupropion
Brand name: WellbutrinWhat makes it different
The antidepressant least likely to cause sexual side effects or weight gain, and often described as activating rather than sedating. Also approved for quitting smoking and for seasonal depression. It lowers the seizure threshold, so it is avoided in people with seizure disorders or certain eating disorders.
How it works
Works mainly on norepinephrine and dopamine rather than serotonin, which explains its very different side effect profile.
- Usually taken in the morning.
- Can increase anxiety, restlessness, or insomnia early on.
The versions: IR, SR, and XL
Same medicine, different release speeds. The active drug is identical; what changes is how fast it enters your system, which decides how often you take it and how smooth the day feels.
- IR (immediate release): releases all at once. Taken two or sometimes three times a day. The oldest form, with the most ups and downs between doses.
- SR (sustained release): releases over about 12 hours. Taken twice a day, morning and evening. No more than 200 mg in a single dose.
- XL (extended release): releases over about 24 hours. Taken once a day in the morning. The smoothest levels and the most common form prescribed today. (Aplenzin is another once daily form made with a different salt; pharmacies treat it like XL.)
Alcohol
Best avoided. Bupropion lowers the seizure threshold, and alcohol does too, especially heavy drinking or the withdrawal period after heavy drinking. Together they raise the seizure risk more than either one alone. Alcohol also works against the depression, anxiety, and sleep benefits you are trying to gain.
Mirtazapine
Brand name: RemeronWhat makes it different
Often chosen when depression comes with poor appetite, weight loss, or broken sleep. It tends to increase appetite and is sedating, so it is usually taken at bedtime. Odd but true: lower doses are more sedating than higher doses, because the histamine calming effect dominates at low doses.
How it works
Boosts norepinephrine and serotonin signaling by blocking specific braking receptors on nerve cells.
- Weight gain is common.
- Dry mouth and morning grogginess often ease with time.
Mood stabilizers sometimes used for depression
These medicines were first developed for bipolar disorder, but in careful hands they also help certain kinds of depression, especially when standard antidepressants have not done enough on their own.
Lithium
Brand names: Eskalith, LithobidWhat makes it different
A naturally occurring mineral and one of the oldest mood medicines in existence. Used in low doses to boost antidepressants that have not fully worked, and it has unique evidence for reducing suicide risk. Requires regular blood level checks plus kidney and thyroid monitoring.
How it works
The full story is still being worked out, but it calms overactive signaling inside brain cells and supports their resilience and growth.
- Stay hydrated and keep salt intake steady.
- Common pain relievers like ibuprofen and some blood pressure medicines can raise lithium to unsafe levels, so always check first.
Lamotrigine
Brand name: LamictalWhat makes it different
Strongest evidence is for preventing the depressive lows of bipolar disorder rather than for unipolar depression. It must be started very slowly because of a rare but serious rash.
How it works
Calms excessive electrical activity by steadying sodium channels and quieting glutamate, the brain's main excitatory signal.
- Any rash in the first weeks needs same day medical attention.
- Otherwise it is usually well tolerated and weight neutral.
When antidepressants need a boost
If one or two antidepressants have not helped enough, the next step is not always a higher dose. Sometimes adding a small dose of a different kind of medication helps the antidepressant work better. One well studied approach uses low doses of certain newer antipsychotics, and the way they work at those low doses surprises most people.
Why antipsychotics are sometimes added for depressionADHD medications
ADHD medications fall into two big families. Stimulants are the most studied and usually the most effective, and they start working within an hour. Nonstimulants build up more gradually and are not controlled substances, which makes them a better fit for some patients. Every entry below shows the generic name first and brand names second, so you always know exactly what you are taking. All stimulant medications are Schedule II controlled substances. Nonstimulants are not controlled.
| Generic | Brand examples | How long it lasts | Typical daily dose | Good to know |
|---|---|---|---|---|
| Methylphenidate | Ritalin, Methylin | About 3 to 4 hours | 10 to 60 mg | The original short acting option, usually taken 2 to 3 times a day. |
| Methylphenidate extended release | Concerta, Ritalin LA, Metadate CD, Aptensio XR | About 8 to 12 hours depending on the product | 18 to 72 mg | One morning dose covers the school or work day. |
| Methylphenidate extended release, liquid and dissolving | Quillivant XR (liquid), Cotempla XR-ODT (dissolving tablet) | About 8 to 12 hours | 20 to 60 mg | Options for children or adults who cannot swallow pills. |
| Dexmethylphenidate | Focalin, Focalin XR | About 4 hours, about 12 hours for XR | 5 to 30 mg | The active half of the methylphenidate molecule, refined the way escitalopram was refined from citalopram. |
| Serdexmethylphenidate and dexmethylphenidate | Azstarys | About 13 hours | one capsule daily | A newer prodrug combination with smooth all day coverage. |
| Methylphenidate patch | Daytrana | Worn up to 9 hours | 10 to 30 mg patch | Useful when pills are a problem. Take it off earlier in the day if evening appetite or sleep suffers. |
Cleared by: methylphenidate is broken down by the liver through a non CYP pathway and the parts leave in the urine.
| Generic | Brand examples | How long it lasts | Typical daily dose | Good to know |
|---|---|---|---|---|
| Mixed amphetamine salts | Adderall, Adderall XR | About 4 to 6 hours, about 10 to 12 hours for XR | 5 to 60 mg | The most widely known ADHD stimulant. |
| Lisdexamfetamine | Vyvanse | About 10 to 12 hours | 30 to 70 mg | A prodrug that stays inactive until the body converts it, which makes the onset smoother. |
| Dextroamphetamine | Dexedrine, Zenzedi | About 4 to 5 hours | 5 to 60 mg | The more active half of the amphetamine mix. |
| Amphetamine extended release | Mydayis | Up to 16 hours | 12.5 to 50 mg | The longest lasting option, for very long days. |
| Amphetamine, dissolving and liquid | Adzenys XR-ODT, Dyanavel XR | About 10 to 12 hours | 3.1 to 18.8 mg | Dissolving tablet and liquid options for those who cannot swallow pills. |
Cleared by: amphetamines are partly broken down by the liver (CYP2D6) and partly leave through the kidneys unchanged.
| Generic | Brand examples | Dosing rhythm | Typical daily dose | Good to know |
|---|---|---|---|---|
| Atomoxetine | Strattera | Once daily, 24 hour effect | 40 to 100 mg | The first nonstimulant approved for ADHD. Takes weeks for full effect and can also ease anxiety for some. |
| Viloxazine extended release | Qelbree | Once daily | 200 to 600 mg | A newer nonstimulant option for children, teens, and adults. |
| Guanfacine extended release | Intuniv | Once daily | 1 to 4 mg | Originally developed for blood pressure. Calms hyperactivity and impulsivity and can help with tics and sleep. May lower blood pressure and cause drowsiness. |
| Clonidine extended release | Kapvay | Usually twice daily | 0.1 to 0.4 mg | Similar to guanfacine and often helpful when sleep is a major issue. Should not be stopped suddenly. |
Cleared by: atomoxetine, viloxazine, and guanfacine are mostly broken down by the liver (mainly CYP2D6 and CYP3A4); clonidine is partly broken down by the liver and partly leaves through the kidneys unchanged.
Food, supplements, and your medications
What you eat and drink can change how your medications work. None of this is about fear, it is about knowing the handful of interactions that actually matter.
Grapefruit
Grapefruit and grapefruit juice can raise blood levels of some psychiatric medications, including buspirone and quetiapine, by slowing the liver enzymes that break them down. Higher levels can mean stronger side effects. Ask your prescriber or pharmacist whether your medication is one of the affected ones.
Caffeine and stimulants
Excess caffeine on top of ADHD stimulants can add up to jitters, a racing heart, anxiety, and wrecked sleep. Energy drinks are the usual culprit. And remember that fluvoxamine makes caffeine feel much stronger all on its own.
St. John's wort
This herbal supplement can trigger serotonin syndrome when combined with SSRIs or SNRIs, and it makes many prescription drugs less effective, including some antidepressants and birth control. Natural does not mean safe to mix.
Alcohol
Alcohol worsens depression and anxiety, increases drowsiness and dizziness from many medications, and interferes with treatment. Safest to avoid, and worth an honest conversation with your prescriber if that feels hard.
Everyday supplements
Melatonin, magnesium, omega 3s, and vitamin D are popular and generally gentle, but even these can interact with medications or be unwise in certain health conditions. Tell your prescriber about everything you take, including teas, powders, and gummies.
Miracle claims
Supplements are not tested for safety and effectiveness the way prescription medications are. If a product promises dramatic results with no effort, that promise is the warning sign.
Serotonin syndrome: rare, serious, and worth knowing about
Serotonin syndrome happens when serotonin activity in the brain gets too high, almost always from combining things that raise serotonin. It is uncommon, and severe cases are rare, but knowing what it looks like is empowering, because nearly every case is preventable.
What it looks like. It usually shows up within hours of starting a new medicine, raising a dose, or adding a supplement. Watch for a cluster, not a single symptom: agitation or confusion, sweating, fever, fast heartbeat, dilated pupils, tremor, muscle twitching or rigidity, overactive reflexes, and nausea or diarrhea. Mild cases can look like intense jitters with an upset stomach. Severe cases bring high fever, rigid muscles, and confusion, and that is an emergency room situation.
Combinations to avoid. The classic dangerous pair is an SSRI or SNRI with an MAOI antidepressant. Other risky additions include St. John's wort, 5 HTP, tryptophan, SAMe, tramadol, the cough suppressant dextromethorphan, and the antibiotic linezolid. Migraine triptans are often mentioned, but the real world risk there is very low.
Your power move. There is no exact percentage for how often this happens, because mild cases go unrecognized, but severe cases from medicines taken as prescribed are rare. Most cases trace back to overdoses or risky combinations. The habit that prevents nearly all of it is simple: tell every prescriber and pharmacist about every medicine, supplement, and over the counter product you take, every single time.
Selected research
A few key studies behind the medications above. Links open the abstract on PubMed, a free public database from the U.S. National Library of Medicine.
-
Mirtazapine versus other antidepressive agents for depression
Watanabe et al. · Cochrane Database of Systematic Reviews · 2011
Across 29 randomized trials with nearly 5,000 participants, mirtazapine appeared to improve symptoms sooner than SSRIs for some patients. It caused more sleepiness, appetite increase, and weight gain, but less nausea and sexual dysfunction than SSRIs.
-
Bupropion-SR, sertraline, or venlafaxine-XR after failure of SSRIs for depression
Rush et al. · The New England Journal of Medicine · 2006
After an initial SSRI had failed, switching to bupropion SR, sertraline, or venlafaxine XR produced similar overall results. This supports bupropion as one reasonable next step, not as a universally better option.
Want to talk through your options?
Book a consultation and we will go over what might fit you, with honest answers and no pressure.
Book a Consultation