Negative Symptoms vs. Medication Side Effects: How To Tell the Difference

Medically reviewed by Anna Kravtsov, D.O.

Written by Emily Van Devender

Posted on November 2, 2026

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Key Takeaways

When being treated for schizophrenia, some medication side effects can look very similar to the condition's own negative symptoms, making it tricky to know what is causing certain changes.
Negative symptoms of schizophrenia, sometimes remembered as 'the 5 As,' include things like reduced emotional expression, low motivation, social withdrawal, speaking less, and finding less joy in activities. Some antipsychotic medications used to treat schizophrenia can cause side effects that closely mirror these same symptoms, such as sedation, slowed movements, and emotional changes.
Tracking your symptoms, including when they start and whether they get worse after treatment changes, can be a helpful step to share with your doctor so they can work with you to find a treatment plan that fits your needs.

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When you’re being treated for schizophrenia, certain medication side effects can look very similar to some of the condition’s negative symptoms. Because of this, it can sometimes be hard to tell if a treatment is working or if your schizophrenia symptoms are increasing.

Your doctor can work closely with you to help you find a balance between managing the negative symptoms of schizophrenia and minimizing treatment side effects, including those that mimic negative symptoms.

This guide explains the difference between negative symptoms and medication side effects and offers tips to tell them apart.

Negative Symptoms of Schizophrenia

Negative symptoms differ from the symptoms many people associate with schizophrenia, such as hallucinations or delusions.

Instead, they involve a decrease or absence of typical behaviors and emotions and are often among the first signs of the condition. You can remember the main negative symptoms of schizophrenia as “the 5 As,” which include:

Affective flattening — This means reduced emotional expression. You might be less likely to show facial expressions that match your emotions (like smiling or grimacing), or you may use fewer hand gestures when you speak.

Avolition — Avolition is a lack of motivation to do what you need or want to do. Even when you know that showering or working is important, you may struggle to get started.

Asocial behavior — Being asocial means you have little interest or less interest than usual in connecting socially with other people. You might withdraw from friends and family, avoid meeting new people, or just spend most of your time alone.

Alogia — Alogia means not speaking much. Although you might still want or need to communicate with others, you might use few words or struggle to keep conversations going.

Anhedonia — Anhedonia means having less enjoyment or pleasure than usual, even from activities you normally get excited about. You might find things like sex or music to be uninteresting.

Negative symptoms are called primary when they arise directly from schizophrenia. Primary negative symptoms don’t come from another cause, such as another mental health condition or schizophrenia medication side effects.

Medication Side Effects

Doctors often prescribe antipsychotics for schizophrenia. These medications can make symptoms such as hallucinations and delusions less frequent and less intense. They can cause a wide range of side effects depending on the specific medication you take.

Some of these side effects are so similar to negative symptoms that they’re considered secondary negative symptoms. In some cases, certain antipsychotics can even make negative symptoms worse.

While the complete list of possible antipsychotic side effects is too long to list here, common categories include the following:

Emotional side effects — Some antipsychotics may change the way you feel or express your emotions. You might feel more anxious, irritable, or sad than usual.

Anticholinergic side effects — These occur when certain antipsychotics affect how a chemical called acetylcholine works in your body. These side effects vary and can include feeling hot, reduced sweating, trouble urinating, constipation, blurry vision, and more.

Metabolic side effects — Some antipsychotics can change your metabolism, which is how your body turns food into energy. This can put you at an increased risk of weight gain, diabetes, heart problems, and more.

Nervous system side effects — Many antipsychotics affect dopamine, a brain chemical that helps control movement. These medications may lead to muscle stiffness, seizures, sleepiness, akathisia (being unable to stay still), and parkinsonism (tremors or other symptoms that resemble Parkinson’s disease).

Some antipsychotics can cause a rare but serious and potentially life-threatening nervous system reaction called neuroleptic malignant syndrome (NMS). NMS can cause high fever, very stiff muscles, and changes in consciousness, such as confusion or reduced alertness. Get emergency medical care right away if you have symptoms of NMS.

When Medication Side Effects Tend To Occur

Side effects vary from person to person, including when they occur and how long they last. Some people may experience no side effects at all.

Many side effects are more likely to occur when you first start taking a medication or after a dose change. Other effects may appear after you’ve taken the medication for a longer time. These include tardive dyskinesia (unusual movements you can’t control) and changes in metabolism.

Stopping antipsychotics suddenly can also cause withdrawal symptoms and, in some cases, serious complications. NMS is a rare but potentially life-threatening reaction most often linked to antipsychotic use. It has also been reported after stopping these medications suddenly.

Most cases of NMS occur within the first 10 days of starting treatment.

How Negative Symptoms and Side Effects Can Look Similar

Some medication side effects are nearly indistinguishable from negative symptoms of schizophrenia. However, since they have different causes, they’re managed differently.

Sedation

Negative symptoms such as a lack of motivation and reduced emotional expression might look like sedation or sleepiness. Sedation is also a common side effect of certain antipsychotics.

When a medication brings it on, sedation can also worsen negative symptoms you already experience, such as social withdrawal or a flat affect (reduced emotional expression).

Slowed Movements

Some antipsychotics can make it harder to move by causing muscle stiffness. Negative symptoms can also cause you to move less.

For example, you might make fewer movements with your face, head, or hands because of affective flattening. A lack of motivation might also cause you to move less in general.

Emotional Changes

Many negative symptoms of schizophrenia can also occur in depression. In some cases, these symptoms may come from depression that occurs alongside schizophrenia, rather than from schizophrenia itself.

Emotional changes from medications can also include depressed mood as a side effect, though some antipsychotics can help treat depression symptoms.

How To Tell Negative Symptoms and Medication Side Effects Apart

It’s not always easy to tell the difference between negative symptoms that come from schizophrenia and side effects of medications you take for schizophrenia.

However, you and your healthcare provider can take steps to tell them apart and adjust your treatment if needed.

Track Your Symptoms

If possible, it may be helpful to track your symptoms and how they change over time.

Be sure to note which specific symptoms you’re experiencing, when they start, and whether they seem to improve. Make note of any symptoms that first appear or seem to get worse after any change in your treatment plan.

Talk to Your Provider

Your doctor may have more insight into what you’re experiencing if you’re having trouble telling negative symptoms from medication side effects. If you’ve been tracking your symptoms, be sure to bring your notes to your appointment, including any questions you have.

If your doctor determines your negative symptoms are actually medication side effects, they might advise you to see if they improve over time. If they’re severe and long-lasting, your doctor can discuss adjusting your dose or switching medications, taking your preferences into account.

It’s normal to have to try several medications before finding the right fit. However, talk to your doctor before stopping or changing any medication.

Your doctor may also adjust your treatment plan to address negative symptoms more directly. They may also recommend case management (help coordinating your care), psychotherapy (talk therapy), or other support to help you manage daily activities.

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