Risperidone is used to treat and prevent the return of psychotic symptoms.


What is this medication used for​​​​

​Risperidone is used to treat and prev​​ent the return of psychotic symptoms such as:​

  • hearing or seeing things that are actually not present
  • confused or unreal thoughts
  • uncontrolled anger

It can also be used to treat manic symptoms in bipolar disorder such as:

  • elated mood
  • irritability​
  • increased activity and energy

Risperidone may also be used for other conditions – check with your doctor.

Dosage and How to Use​​

Follow the directions on your medicine label and take the medicine exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor. Risperidone can be taken with or without food. ​​​​

If you are taking risperidone oral solution:​​

  • Measure the dose carefully with the measuring tube (pipette) provided
  • You may mix the dose of oral solution with a small glass of water, coffee, orange juice or low-fat milk. Do not mix with tea, cola or alcoholic drinks.​

If you are on Risperidone (Risperdal Consta TM) injection:
  • It is injected into your upper arm or buttocks.

The medicine may not work for you straightaway. Continue to take it regularly. It may take a few weeks before you feel the full benefits of the medicine. 

Even after you feel better, you should continue taking this medicine regularly to prevent your symptoms from returning. Do check with your doctor on the appropriate length of treatment you need.

Do not stop taking or adjust the dose without talking to your doctor or pharmacist first.

Missed a Dose

Take the missed dose as soon as you remember it. However, if it is more than half way between the doses, skip the missed dose and take your medicine at the usual time.

Do not take two doses at the same time to make up for a missed one.

If you miss your Risperidone (Risperdal ConstaTM) injection, please arrange for an appointment with your doctor.

If you have problems remembering your doses, speak to your pharmacist or doctor. 


Side Effects, Precautions, Contraindication

Before using this medicine:

Tell your doctor if you have or have ever had Parkinson’s disease; Alzheimer’s disease; heart, liver or kidney disease; stroke; diabetes; seizures (fits); breast cancer; or drug allergies.

FOR WOMEN: Tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding.

Precautions while taking this medicine:

  • Avoid drinking alcohol while taking this medicine as it can cause excessive drowsiness.

  • Risperidone may sometimes worsen blood glucose control in diabetes. Maintain regular check-ups with your doctor.

  • Taking some other medicines with risperidone may affect how they work. Be sure that you tell all doctors, pharmacists, dentists and other health care providers who treat you about all medicines and natural remedies you are taking.

Possible Side Effects

Like all medicines, this medicine may also cause some POSSIBLE side effects but not everyone experiences them.

Drink more water, eat more high-fibre foods, and exercise regularly

Consult a doctor or pharmacist if you need a laxative  

​Common side effects What can I do about it?
​​​​​(Generally affect up to 10% of patients)​ ​​

​Most of the side effects below improve as your ​body gets used to the medicine. Speak to your doctor or pharmacist if they persist, worsen or become too bothersome. ​​​​​​​​​​​​​​​​

Stomach upset​​Take the medicine with or after food.

Take small but frequent meals; avoid rich or spicy foods.

​Constipation​​Drink more water, eat ore high-fibre foods, and exercise regularly

Consult a doctor or pharmacist if you need a laxative

DizzinessGet up slowly from sitting or lying down position.
Difficulty sleeping

Avoid daytime naps.

Listen to relaxing music at bedtime

DrowsinessAvoid driving, or engaging in activities requiring concentration.
Feeling hot or decreased sweating

Drink plenty of water and take extra care not to overheat yourself while exercising or in hot weather.

Weight gain

Exercise regularly and eat a healthy, balanced diet 


Feeling anxious;

Stuffy or runny nose;

Mild pain, itchiness, redness or swelling at the injection site 
(For Risperidone injection only)​​

Speak with the doctor if any of these become bothersome



​​Check with your doctor as soon as possible if you experience any of the following: 

​​~ Allergic reaction: Skin rash or itching; swelling in the face, eyes or tongue; chest tightness; difficulty breathing 

~ Fast or irregular heartbeat

~ High fever, muscle stiffness or confusion

​​~ Difficulty in speaking or swallowing​ 

~ Muscle spasms (such as face, neck, back and eyelids), twitching or uncontrolled body movements​

~ Restlessness or need to keep moving constantly​​ 

~ Seizures (fits)

~ Blurred vision

~ Sudden weakness or numbness in the face, arms or legs, and speech or vision problems​


If you experience any other side effects that you think are caused by your medicine, please consult your doctor or pharmacist. 


Handling and Storage

Store this medicine at room temperature, away from direct light, heat and moisture (not in the bathroom) and out of reach of children. Throw away any medicine that has expired or is no longer needed.

Do not share this medicine with other people.

If you have questions/concerns about this medicine, please ask your doctor or pharmacist. 

Institute of Mental Health

Pharmacy Department​​
10 Buangkok View
Singapore 539747

For medication enquiries: (during office hours)

IMH Clinic B/ Sayang Wellness: 63892077

IMH Clinic C (NAMS): 63893666

Community Wellness Clinic, Queenstown: 64715797

Community Wellness Clinic, Geylang: 67461724​

Child Guidance Clinic (HPB): 64353807

Child Guidance Clinic (Sunrise Wing): 63892410

Email: enquiry@imh.com.sg



Fluticasone Inhaler

Medication Information Leaflet

Pharmaceutical Society of Singapore
Formoterol / Fluticasone Inhaler

Medication Information Leaflet

Pharmaceutical Society of Singapore
Formoterol / Beclomethasone Inhaler

Medication Information Leaflet

Pharmaceutical Society of Singapore

More A-Z


 Catalog-Item Reuse

Back to Top