✓ Medically reviewed by Dr Kudrat Jain – Consultant Psychiatrist, SSHIMOH, Noida.
Few prescriptions generate as much anxiety as this one. People worry that antidepressants will change their personality, that they will be stuck on them for life, that needing them says something about their strength. Very little of that reflects what actually happens.
This page explains what these medicines do, what to expect in the first weeks, which side effects are common and which need a call to your doctor, and how the decision to stop is made. It is general information — your own prescription should always be discussed with the psychiatrist who knows your history.
What antidepressants actually do
The short honest answer is that we understand the effects better than the mechanism. Most antidepressants change the availability of neurotransmitters such as serotonin and noradrenaline within hours — but the clinical benefit takes weeks. That gap tells us the chemical change is the trigger, not the cure.
The current understanding is that these medicines gradually promote changes in how brain circuits adapt and reorganise, which is slower than a simple chemical top-up. This is also why "chemical imbalance" is an oversimplification that most psychiatrists have moved away from.
What this means practically: do not judge the medicine in week one, and do not expect it to feel like a painkiller.
The main classes you are likely to be offered
SSRIs are usually first choice because they are effective and relatively well tolerated. SNRIs act on a second neurotransmitter and are often used where pain or fatigue is prominent. Older tricyclics and MAOIs are highly effective but have more interactions and side effects, so they are used more selectively. Others, such as mirtazapine or bupropion, are chosen for specific profiles — sleep and appetite in one case, low energy and smoking cessation in the other.
Which one suits you depends on your symptoms, other medical conditions, other medicines and, importantly, what has worked for you or close relatives before.
How long before they work
Expect a realistic timeline: some improvement in sleep, appetite or agitation in the first one to two weeks; meaningful change in mood usually between weeks four and six; full benefit sometimes not until eight to twelve weeks.
A very common pattern is that other people notice the improvement before you do. Mood is judged from inside the mood, which is not a reliable vantage point. This is why clinicians repeat structured measures like the PHQ-9 depression questionnaire — it makes change visible even when it does not feel dramatic.
If there is no change at all by six to eight weeks at an adequate dose, that is information, not failure. It usually means adjusting the dose or switching, and most people who do not respond to the first antidepressant respond to another.
Side effects: common, temporary, and worth reporting
Common and usually settling
Nausea, headache, dry mouth, mild agitation and disturbed sleep are common in the first one to two weeks and usually fade. Taking the dose with food, or at a different time of day, often helps.
The single most common reason people stop a medicine that would have worked is quitting during this early window. If you can get through the first fortnight, the balance usually shifts.
Ones that may persist and are worth discussing
Sexual side effects — reduced desire, delayed orgasm, difficulty with arousal — are common, frequently under-reported out of embarrassment, and a very legitimate reason to change medication. Please raise it; there are alternatives.
Weight change, emotional blunting (feeling neither low nor particularly anything), and daytime sedation also matter. None of these should be accepted as the price of treatment without at least a conversation about alternatives.
Ones that need a call the same day
A marked increase in agitation or restlessness, new or worsening thoughts of self-harm, especially in the first weeks or after a dose change. Also any combination of high fever, confusion, muscle rigidity or severe tremor, which can indicate a rare but serious reaction.
If you are having thoughts of harming yourself, contact us on +91 72669 93399, call 112, or go to your nearest emergency department. Do not wait for the next appointment.
Will I have to take them forever?
Usually not. For a first episode of depression that responds well, treatment is commonly continued for six to twelve months after you feel better — not because you still feel ill, but because stopping at the point of recovery has a high relapse rate.
For people who have had several episodes, or whose episodes were severe, longer-term treatment is often recommended. That is a risk-benefit conversation, not a life sentence.
Either way, stopping should be planned and tapered rather than abrupt. Stopping suddenly can cause discontinuation symptoms — dizziness, electric-shock sensations, irritability, flu-like feelings — which are unpleasant and easily mistaken for relapse.
Medication or therapy?
This is presented as a choice far more often than it needs to be. For mild to moderate depression, psychological therapy alone is frequently the first recommendation. For moderate to severe depression, the combination of medication and therapy generally outperforms either alone.
Medication and therapy also do different jobs. Medication can lift you to the point where you are able to engage; therapy changes the patterns that made you vulnerable. We compare them in more detail in therapy versus medication for depression and anxiety, and our CBT page explains what the therapy side actually involves.
If you would prefer to start without medication, that is a legitimate conversation to have — see depression treatment without medication.
Questions worth asking your psychiatrist
Why this particular medicine for me? How long before we expect to see a change? What side effects should I expect, and which ones mean I should call you? How long do you expect me to take it? What is the plan if it does not work? How will we decide when to stop?
A good psychiatrist will welcome these questions. If you are choosing a clinician, our guide to choosing a psychiatrist in Noida sets out what else to look for.
Managing specific side effects rather than enduring them
Most side effects have a practical answer, and the first move is almost never to stop the medicine abruptly.
Nausea and stomach upset
Usually worst in the first week. Taking the dose with food, or moving it to a different time of day, resolves it for most people. If it persists beyond two weeks, tell your prescriber rather than quietly stopping.
Sleep problems
Some antidepressants are activating and are better taken in the morning; others are sedating and better at night. Simply moving the timing fixes a great deal of this. If insomnia persists, it should be treated in its own right rather than left — see our guide to insomnia and mental health.
Sexual side effects
Common, rarely volunteered, and a legitimate reason to change medicine. Options include dose adjustment, switching to an antidepressant with a lower incidence, or adding something. Nobody should stay silently on a medicine that has removed an important part of their life.
Weight change
Varies considerably between medicines. If weight gain is significant or distressing, it is worth discussing a switch, alongside practical support around diet and activity.
Interactions worth flagging to your doctor
Tell your prescriber about everything you take, including over-the-counter medicines, Ayurvedic or herbal preparations and supplements. Some combinations meaningfully increase risk — for example, combining certain antidepressants with tramadol, with some migraine medicines, or with St John’s wort.
Also mention any history of bipolar disorder or of elevated mood on a previous antidepressant. As we explain in bipolar disorder versus depression, that history changes the safest choice substantially.
If you are pregnant, planning pregnancy or breastfeeding, say so at the outset. Decisions are made differently, but stopping abruptly on discovering a pregnancy is usually the wrong move and should not be done without advice.
Coming off antidepressants safely
The decision to stop should be planned rather than impulsive, and timed sensibly — not in the middle of a major life stressor, and ideally not in the season you historically find hardest.
Tapering is usually done gradually over weeks, sometimes longer for medicines with a short half-life. Discontinuation symptoms — dizziness, brief electric-shock sensations, irritability, flu-like feelings, vivid dreams — are unpleasant but not dangerous, and they are a sign the taper is too fast rather than a sign the depression has returned.
Distinguishing discontinuation from relapse matters. Discontinuation symptoms appear within days of a dose reduction and improve if the dose is restored; relapse builds more slowly and involves the return of mood symptoms rather than physical sensations.
Keep some form of monitoring going for several months after stopping, because that is when relapse risk is highest.
What a medication review at SSHIMOH involves
If you are starting an antidepressant, the first appointment covers more than a prescription. We take a full history, including any previous trials and what happened on them, family history of response, physical health, other medicines and any history of elevated mood.
That last point determines whether an antidepressant alone is safe, and it is the single most common thing missed when medication is prescribed quickly.
We then agree what we are treating and how we will know if it is working — usually by repeating a structured measure such as the PHQ-9 at intervals, rather than relying on recollection.
Follow-up is typically at two weeks, to check tolerability and safety rather than efficacy, then at four to six weeks to judge response. Most dose adjustments happen at that second review.
If you are already on medication that is not working and want a second opinion, bring your prescriptions and any records. Knowing exactly what has been tried, at what dose and for how long, changes the recommendation substantially — a great many "treatment-resistant" depressions turn out to be under-treated ones.
Frequently Asked Questions
How long do antidepressants take to work?
Some early change in sleep or appetite often appears within one to two weeks, but meaningful improvement in mood usually takes four to six weeks, and full benefit can take up to twelve.
Do antidepressants change your personality?
They should not. The goal is to return you to yourself, not to alter who you are. Some people do report emotional blunting — feeling flatter overall — and that is worth reporting, because it often improves with a dose change or a different medicine.
Are antidepressants addictive?
They are not addictive in the way alcohol or benzodiazepines are: they do not cause craving or escalating use. They can cause discontinuation symptoms if stopped suddenly, which is why doses are tapered.
Can I drink alcohol while taking antidepressants?
Alcohol worsens depression, disturbs sleep and can amplify sedation. Most psychiatrists advise avoiding it, particularly early in treatment. If you drink heavily, tell your doctor honestly — it changes which medicine is safe.
What if the first antidepressant does not work?
That is common and does not mean treatment will fail. Roughly a third to a half of people do not respond adequately to the first medicine, and most of them respond to a change of dose, a different drug, or the addition of therapy.
Can I stop once I feel better?
Not immediately. Stopping at the point of recovery carries a high relapse risk, which is why treatment is usually continued for six to twelve months afterwards and then tapered.
References and further reading
- World Health Organization — Depression
- National Institute of Mental Health — Depression
- Tele-MANAS, Ministry of Health and Family Welfare
Decisions about medication should be made with someone who knows your history
Nothing on this page can tell you whether an antidepressant is right for you. What it can do is give you better questions to bring to the appointment.
If you would like that appointment, call +91 72669 93399 or book a consultation with one of our psychiatrists in Noida.