Recognizing the difference between symptoms of schizophrenia and medication-related effects can be complicated, especially for someone who has not been diagnosed but has begun noticing changes in their thoughts, emotions, perceptions, or behavior. Experiences such as auditory hallucinations, visual hallucinations, olfactory hallucinations, disorganized speech, paranoia or feeling disconnected from yourself can have many possible causes and do not automatically mean that someone has schizophrenia.
Certain medications can also cause or worsen psychiatric symptoms in some patients, making it important to consider when symptoms began, whether they followed a new medication or dosage change, and how they are affecting everyday life. Rather than trying to determine the cause alone, a thorough evaluation with a qualified healthcare provider can help clarify what may be happening and identify the safest next steps.
What Are the Most Common Symptoms of Schizophrenia?
Schizophrenia can affect the way a person thinks, feels, communicates, and experiences the world around them. Symptoms can vary significantly from one person to another and may change in type or intensity over time. Clinicians generally group schizophrenia symptoms into three categories: positive, negative, and cognitive symptoms. The National Institute of Mental Health (NIMH) refers to positive symptoms as psychotic symptoms.
Similar changes can occur with other mental health conditions, substance use, medical conditions, sleep disruption, and, in some cases, as a reaction to certain medications. Psychiatric evaluation can determine what may be contributing to new or concerning symptoms.
Positive Symptoms of Schizophrenia
Clinicians define positive symptoms as experiences added to a person’s typical thoughts, perceptions, or behaviors. The word “positive” does not mean that these symptoms are beneficial. Instead, it describes experiences that are present when they ordinarily would not be.
Positive symptoms may include:
- Hallucinations: Seeing, hearing, feeling, smelling, or tasting something that others do not experience. Hearing voices is one of the more commonly associated hallucinations in schizophrenia.
- Delusions: Strongly held beliefs that are not supported by objective reality, such as believing someone is trying to cause harm or that ordinary events contain special messages meant specifically for the individual.
- Disorganized thinking or speech: Difficulty organizing thoughts in a way that others can easily follow. A person may move unexpectedly between topics, lose their train of thought, or have difficulty communicating what they mean.
- Changes in behavior: In some cases, behavior or movement may become noticeably unusual or disorganized.
These experiences can feel very real and sometimes frightening to the person experiencing them. Responding with patience rather than confrontation can help create a sense of safety while encouraging the individual to seek support from a behavioral health center, like Milton Recovery Centers.
Negative Symptoms of Schizophrenia
Negative symptoms involve a reduction or loss of abilities, emotions, or behaviors that are typically part of everyday life. These symptoms can sometimes be less noticeable than hallucinations or delusions, but they can have a meaningful impact on relationships, independence, and daily functioning.
Negative symptoms may include:
- Reduced motivation or difficulty starting and completing everyday activities
- Loss of interest or enjoyment in activities that were once meaningful
- Social withdrawal or decreased interest in interacting with others
- Limited facial expressions, vocal tone, or outward displays of emotion
- Low energy or spending significant amounts of time in passive activities
- Difficulty planning and maintaining everyday routines
These changes can resemble depression, medication side effects, or other mental health concerns. It is not always easy to identify their cause based on symptoms alone. A clinician can look at the full picture including when symptoms started, how they have progressed, and whether medications or other factors could be contributing.
Cognitive Symptoms of Schizophrenia
Cognitive symptoms affect attention, memory, decision-making, and the ability to process information. They may be less noticeable to others, but they can still make everyday responsibilities more difficult.
Cognitive symptoms may include:
- Trouble concentrating or staying focused
- Difficulty remembering new information
- Problems following conversations or instructions
- Trouble organizing thoughts or completing multi-step tasks
- Difficulty making decisions
- Problems planning, prioritizing, or keeping track of responsibilities
Difficulty with concentration or memory can have many causes, including stress, anxiety, depression, sleep problems, substance use, and medication effects. These symptoms alone do not point to schizophrenia. If cognitive changes occur alongside hallucinations, unusual beliefs, significant behavioral changes, or a decline in everyday functioning, talking with a qualified mental health professional can help clarify what is happening and guide next steps.
What Medication Side Effects Can Look Like Schizophrenia Symptoms?
Some medication side effects can resemble changes associated with schizophrenia, particularly symptoms involving concentration, motivation, movement, sleep, emotional expression, or confusion. In less common situations, a medication reaction, interaction, toxicity, or withdrawal can contribute to hallucinations, severe agitation, or other changes in thinking and perception. Understanding when symptoms started, whether a medication was recently added or changed, and how the symptoms have progressed can help a healthcare provider determine what may be happening.
If new psychiatric symptoms develop after starting, stopping, or changing a medication, talk with the prescribing provider. Medications should not be stopped or adjusted without medical guidance, since suddenly discontinuing certain medications can cause significant withdrawal symptoms or make an existing condition worse.
Antipsychotic Medication Side Effects
Psychiatrists often prescribe antipsychotic medications to treat psychosis, including hallucinations and delusions related to schizophrenia and other mental health conditions.
Common antipsychotics include:
- Aripiprazole (Abilify)
- Brexpiprazole (Rexulti)
- Cariprazine (Vraylar)
- Lumateperone (Caplyta)
- Lurasidone (Latuda)
- Olanzapine (Zyprexa)
- Paliperidone (Invega)
- Quetiapine (Seroquel)
- Risperidone (Risperdal)
- Ziprasidone (Geodon)
- Asenapine (Saphris)
- Iloperidone (Fanapt)
Depending on the medication, side effects may include:
- Sleepiness or feeling slowed down
- Reduced energy
- Difficulty concentrating
- Restlessness or feeling unable to sit still
- Tremors, stiffness, or slowed movement
- Changes in facial expression or movement
- Weight or metabolic changes
Sedation, reduced energy, and slowed movement can sometimes resemble negative symptoms such as low motivation or decreased emotional expression. Restlessness and involuntary movements can also be mistaken for changes in behavior related to a psychiatric condition.
If a person feels noticeably different after beginning an antipsychotic medication, that change is worth discussing with their treatment team. The provider can look at the timing and nature of the symptoms to determine whether they are more likely related to the condition, the medication, or another factor.
Antidepressant Medication Side Effects
Antidepressants are used to treat depression and may also be prescribed for anxiety and other mental health conditions.
Common medications include:
- Fluoxetine (Prozac)
- Sertraline (Zoloft)
- Escitalopram (Lexapro)
- Citalopram (Celexa)
- Paroxetine (Paxil)
- Fluvoxamine (Luvox)
- Venlafaxine (Effexor XR)
- Duloxetine (Cymbalta)
- Desvenlafaxine (Pristiq)
- Levomilnacipran (Fetzima)
- Bupropion (Wellbutrin)
- Mirtazapine (Remeron)
- Vortioxetine (Trintellix)
- Vilazodone (Viibryd)
Possible side effects may include:
- Sleep changes
- Drowsiness or fatigue
- Difficulty concentrating
- Restlessness
- Agitation
- Headaches
- Nausea
- Changes in mood or behavior
In rare cases, more significant changes in mental state can occur. Certain medication reactions or interactions may contribute to confusion, severe agitation, hallucinations, or unusual behavior. Some antidepressants can also trigger significant mood changes in people who are vulnerable to bipolar disorder or other mood conditions.
New hallucinations, severe confusion, unusual behavior, extreme agitation, or a major shift in mood should be discussed with a healthcare provider promptly. These symptoms can have several possible causes, and a clinician can help determine whether medication may be playing a role.
Mood Stabilizer and Anti-Anxiety Medication Side Effects
Mood stabilizers and anti-anxiety medications include several different types of drugs, and their effects can vary considerably.
Common mood stabilizers include:
- Lithium (Lithobid)
- Divalproex Sodium (Depakote)
- Valproic Acid (Depakene)
- Lamotrigine (Lamictal)
- Carbamazepine (Tegretol or Carbatrol)
Side effects may include fatigue, tremor, dizziness, problems with coordination, slowed thinking, or difficulty concentrating. In cases of medication toxicity, particularly with lithium, more serious symptoms such as confusion, slurred speech, severe shaking, or changes in perception can occur.
Common anti-anxiety medications include:
- Benzodiazepines
- Alprazolam (Xanax)
- Clonazepam (Klonopin)
- Diazepam (Valium)
- Lorazepam (Ativan)
- Buspirone
Possible side effects of anti-anxiety medications may include:
- Drowsiness
- Slowed thinking
- Memory problems
- Difficulty concentrating
- Problems with coordination
- Confusion
- Changes in alertness
Benzodiazepines can also lead to physical dependence with ongoing use. If they are stopped suddenly or reduced too quickly, withdrawal may cause severe anxiety, insomnia, agitation, abnormal movements, confusion, and in more serious cases, hallucinations or other psychotic symptoms.
Experiencing an unusual symptom while taking medication does not automatically mean someone has schizophrenia or another psychotic disorder. Medication effects are only one possible explanation. A clinician can review the medication, dosage, recent changes, other substances, physical health, and overall symptom history to better understand what is happening and determine the safest next step.
How to Tell the Difference Between Schizophrenia and Medication Side Effects
Schizophrenia more often involves changes in thinking and perception, such as hallucinations, delusions, or disorganized thoughts. Medication side effects are more likely to show up as physical or metabolic changes, including stiffness, restlessness, marked fatigue, or sudden weight gain, especially after a medication is started or the dose is adjusted.
Psychiatric Evaluation
If you are experiencing hallucinations, unusual beliefs, changes in thinking, or other symptoms that make you wonder whether you may have schizophrenia, you do not have to figure out the cause on your own. The same is true if you are already taking medication and are concerned that it may be changing how you think, feel, or function. A professional evaluation can look at the full picture rather than focusing on one symptom.
This is especially important because psychosis is not exclusive to schizophrenia. It can occur with other mental health conditions, substance use, medication-related problems, and certain medical conditions. Getting evaluated can help identify what is happening and guide you toward the right level of treatment and support.
At Milton Recovery Centers, care begins with understanding what you are experiencing as an individual. Milton provides mental health and co-occurring disorder treatment with personalized planning, medical support, medication management, and evidence-based therapies in an environment designed to feel comfortable and welcoming. If symptoms are interfering with your daily life or leaving you unsure about what to do next, reaching out can be an important first step toward getting answers. Call Milton Recovery Centers at (844) 975-4673 to speak with the admissions team about your symptoms and learn what treatment options may be appropriate for you.
Consider When the Symptoms Started
When symptoms begin can offer important clues. Schizophrenia often develops gradually, while sudden changes may be linked to medication effects, substance use, withdrawal, sleep loss, or another health condition. Tracking what changed around the same time can help a provider better understand the cause.
Look for Changes After Starting or Adjusting a Medication
If you felt stable before a medication change and then developed new restlessness, confusion, sedation, difficulty concentrating, unusual movements, mood changes, hallucinations, or other concerning symptoms, tell the prescribing provider. The timing does not automatically prove that the medication is responsible, but it is an important clue for the clinician evaluating you.
Withdrawal also matters. Certain medications, including benzodiazepines such as alprazolam (Xanax), clonazepam (Klonopin), diazepam (Valium), and lorazepam (Ativan), can cause significant withdrawal reactions if they are stopped abruptly or reduced too quickly. The FDA recommends gradual dose reduction under medical supervision when discontinuing benzodiazepines.
Do not stop or change a prescription medication on your own because you are worried about a side effect. Contact the prescribing provider so the symptoms and medication can be reviewed safely.
Identify Whether Hallucinations or Delusions Are Present
Hallucinations and delusions are two of the symptoms most closely associated with psychosis. A hallucination involves hearing, seeing, feeling, smelling, or tasting something that is not present. A delusion is a strongly held belief that is not supported by objective reality.
Both can occur in schizophrenia, but their presence alone does not establish a schizophrenia diagnosis. Medications, substance use, withdrawal, and other health conditions can sometimes contribute to hallucinations, confusion, or losing touch with reality.
For example, benzodiazepine withdrawal can include hallucinations and other significant changes in mental state. If hallucinations or delusions are new, becoming more frequent, or making it difficult to determine what is real, seek an evaluation promptly. Intentional withdrawal should never be done without the guidance of a medical professional because there is a risk of life-threatening seizures and severe withdrawal reactions.
Pay Attention to Changes in Movement, Energy, and Alertness
Schizophrenia can involve very low energy, reduced motivation, limited facial expression, and difficulty completing routine activities. Antipsychotic medications can also cause drowsiness and restlessness, and some may contribute to movement-related side effects.
Pay attention to changes such as:
- Trembling or shaking
- Muscle stiffness
- Slowed movement
- Repetitive or involuntary movements
- Feeling unable to sit still
- Significant drowsiness
- Unusual fatigue
- Feeling physically or mentally slowed down
If these changes began after starting or changing medication, share that information with your provider. Details about when symptoms occur and whether they improve or worsen throughout the day can also be helpful.
Review Other Medications, Substances, and Health Conditions
A mental health evaluation should include more than psychiatric medications. Prescription drugs, over-the-counter medications, supplements, alcohol, recreational substances, and medication interactions can all be relevant when someone develops changes in thinking or behavior.
Physical health matters too. Sudden confusion and other mental status changes can sometimes be related to medical illness, medication toxicity, intoxication, or withdrawal. Lithium toxicity, for example, can cause symptoms such as confusion, tremor, movement problems, and slurred speech.
Before an evaluation, make a complete list of:
- Prescription medications
- Over-the-counter medications
- Vitamins and supplements
- Alcohol use
- Cannabis use
- Recreational or non-prescribed substances
- Recent medication changes
- Recent changes in physical health
- Significant changes in sleep
Being open about everything you are taking or using gives your healthcare team more information to work with. The goal is not judgment. It is to understand what may be affecting your symptoms so that treatment decisions can be made as safely and accurately as possible.
Can Medication Cause Psychosis or Schizophrenia-Like Symptoms?
Yes. Some medications can cause symptoms that resemble psychosis, including hallucinations, delusional thinking, confusion, agitation, or major changes in mood and behavior. This is not the same as developing schizophrenia, which is a separate mental health disorder with its own diagnostic criteria and pattern of symptoms.
Certain stimulant medications, including amphetamine-based medications, have been associated with new psychotic or manic symptoms in some people. Corticosteroids, such as prednisone or prednisolone, can also cause significant mood and behavioral changes and, in some cases, psychosis.
Medication withdrawal can also affect mental health. For example, suddenly stopping or rapidly reducing a benzodiazepine can cause serious withdrawal reactions, which is why these medications should be tapered under medical supervision.
Can Schizophrenia Medication Make Symptoms Feel Worse?
Yes. Antipsychotic medications are intended to reduce symptoms such as hallucinations, delusions, and disorganized thinking, but side effects can sometimes make a person feel worse in other ways. Fatigue, restlessness, stiffness, slowed movement, difficulty concentrating, or emotional changes may affect daily functioning and can sometimes be mistaken for worsening schizophrenia symptoms.
If symptoms change after starting a medication or adjusting the dose, talk with the prescribing provider. A different dose, medication, or treatment approach may be appropriate, but antipsychotic medication should not be stopped without medical guidance.
Digital treatments are also becoming part of schizophrenia care. In July 2026, the FDA cleared Motivista (CT-155), a prescription digital therapeutic designed to treat negative symptoms of schizophrenia in adults with stable positive symptoms. It is used alongside clinician-managed outpatient care, including antipsychotic medication, rather than as a replacement for medication.
The FDA clearance was supported by the CONVOKE clinical study, which evaluated a 16-week, app-based behavioral treatment for adults with schizophrenia. The study found improvements in negative symptoms and reported no device-related serious adverse events. This type of treatment points to a growing role for prescription digital therapeutics in mental health care, giving patients and clinicians additional tools that may complement medication and traditional therapy.
Why You Should Not Stop Psychiatric Medication Without Medical Guidance
Stopping a psychiatric medication suddenly can cause withdrawal symptoms, a return or worsening of the condition being treated, or new changes in mood, sleep, thinking, and behavior. Some medications need to be reduced gradually so the body has time to adjust. NIMH recommends working with a healthcare provider to safely decrease psychiatric medications rather than stopping them independently.
This is especially important with benzodiazepines such as Xanax, Klonopin, Valium, and Ativan. The FDA warns that stopping these medications abruptly or reducing them too quickly can cause serious withdrawal reactions, including seizures.
If you are concerned that a medication is causing side effects or making your symptoms worse, contact your prescribing provider before changing your dose. They can review what you are experiencing and determine whether a slower taper, dosage adjustment, or different treatment may be safer.
How Milton Recovery Centers Can Help Evaluate Schizophrenia Symptoms and Possible Medication Side Effects
At Milton Recovery Centers, our clinical team takes the time to understand what you are experiencing and what may be contributing to your symptoms. Through a comprehensive psychiatric evaluation, medication review, and ongoing monitoring, we can determine whether changes in mood, thinking, behavior, or perception may be related to schizophrenia, medication side effects, or another underlying concern.
If medication is part of the problem, our team can help you stabilize safely, evaluate whether a different medication or dosage may be appropriate, and adjust treatment with care. The goal is to help you feel more clear, comfortable, and like yourself again while improving symptoms, daily functioning, and long-term stability.
