PrEP Singapore 2026

HIV Prevention and Medical Consultation – Understanding HIV PrEP, Eligibility, Testing and Ongoing Care

HIV Pre-Exposure Prophylaxis, commonly known as PrEP, is a medical approach to reducing the risk of HIV infection before potential exposure occurs. For individuals who may have an ongoing or anticipated risk of acquiring HIV, PrEP can form part of a broader preventive healthcare plan.

At Kensington Family Clinic, patients can seek medical advice about HIV prevention, undergo appropriate HIV and sexually transmitted infection (STI) screening, and discuss whether PrEP may be suitable for their circumstances.

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What Is PrEP and How Does It Prevent HIV?

PrEP stands for Pre-Exposure Prophylaxis. It involves the use of prescribed antiretroviral medication by individuals who do not have HIV to reduce their likelihood of acquiring the infection.

HIV attacks the body’s immune system, particularly certain white blood cells that help protect against infection.

When PrEP is taken correctly, the medication helps prevent HIV from establishing an infection following exposure.

PrEP is a preventive measure rather than a treatment for an existing HIV infection. It is important to understand that PrEP does not eliminate all HIV risk and does not prevent other sexually transmitted infections or pregnancy.

A medical consultation is necessary before starting PrEP. This includes confirming HIV-negative status, reviewing relevant medical history and assessing whether ongoing monitoring is required.

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Who May Benefit From HIV PrEP?

PrEP is not limited to any particular gender, sexual orientation or relationship status.

A doctor may consider PrEP for people whose sexual health circumstances suggest an increased likelihood of HIV exposure.

Examples include:

Individuals With Multiple or New Sexual Partners

People who have new or multiple sexual partners may wish to discuss their HIV prevention options, particularly when partners’ HIV status is unknown.

Individuals Who Do Not Consistently Use Condoms

PrEP may be considered as an additional preventive measure for people who have difficulty maintaining consistent condom use.

However, condoms remain useful for reducing the risk of other STIs.

Individuals With a Recent STI Diagnosis

A recent diagnosis of syphilis, gonorrhoea, chlamydia or another STI may indicate circumstances in which an HIV risk assessment would be appropriate.

Individuals Who Have Previously Taken HIV PEP

Patients who have required Post-Exposure Prophylaxis (PEP), particularly on more than one occasion, may benefit from discussing whether PrEP is appropriate for future prevention.

Individuals With Partners Living With HIV

PrEP may be considered in certain relationships where a partner living with HIV has a detectable or unknown viral load.

Where a partner maintains a sustained undetectable viral load through effective treatment, HIV is not sexually transmitted (U=U).

Individuals Anticipating Increased HIV Exposure

Some people may experience periods when their circumstances change and HIV exposure becomes more likely.

A doctor can assess whether PrEP is appropriate during these periods.

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Daily PrEP and On-Demand PrEP in Singapore

Oral PrEP may be prescribed using different dosing approaches.

The choice depends on medical suitability, exposure patterns and the ability to follow the prescribed schedule.

Daily HIV PrEP

Daily PrEP involves taking prescribed medication consistently every day.

It may be considered for people with regular or unpredictable potential HIV exposure.

Daily PrEP has the advantage of a consistent routine, although adherence remains essential.

It does not provide immediate protection when treatment begins.

For commonly used daily oral PrEP regimens, the time to reach maximum protective medication levels is estimated at approximately seven days for receptive anal exposure and up to approximately 21 days for receptive vaginal exposure. These are not universal guarantees, and the time to protection for some other exposure types is not established.

Patients should follow their doctor’s instructions about when protection can be expected.

On-Demand or Event-Driven PrEP

On-demand PrEP is an alternative dosing approach that may be considered for selected eligible individuals.

Instead of taking medication every day, doses are scheduled around anticipated sexual activity.

A recognised event-driven approach is called the 2-1-1 regimen.

It requires medication before and after the anticipated exposure, following a specific schedule.

This approach has been studied primarily in adult men who have sex with men and is not recommended for all populations or exposure types.

On-demand PrEP should only be used following medical assessment and appropriate prescribing advice.

Which PrEP Regimen Is Suitable?

There is no single regimen that is appropriate for every individual.

A doctor will consider factors including:

Frequency and predictability of potential exposure.
Type of sexual exposure.
HIV test results.
Kidney and liver health.
Hepatitis B status.
Other medical conditions and medications.
Ability to adhere to the prescribed schedule.

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What Tests Are Required Before Starting PrEP?

PrEP should only be initiated after appropriate clinical assessment.

Several tests may be recommended to establish eligibility and identify medical considerations that could affect treatment.

HIV Blood Test

Confirming that the patient does not have HIV is an essential requirement before starting PrEP.

A fourth-generation HIV antigen/antibody test is commonly used.

The doctor will also consider whether additional testing is necessary because of recent exposure, symptoms or previous medication use.

If an individual has acquired HIV very recently, an initial test may not detect the infection.

Starting PrEP without excluding HIV infection may complicate diagnosis and contribute to drug resistance.

Kidney Function Blood Test

Some oral PrEP medications are processed through the kidneys.

Kidney function assessment helps identify patients who may require additional monitoring or may not be suitable for a particular regimen.

Hepatitis B Screening

Hepatitis B screening is important because certain oral PrEP medications also have activity against hepatitis B.

Patients with chronic hepatitis B may require a specific treatment approach and additional monitoring if medication is discontinued.

Hepatitis C Screening

Hepatitis C screening may be recommended based on individual risk factors and clinical assessment.

Screening for Other STIs

The doctor may recommend STD screening for:

Syphilis.
Gonorrhoea.
Chlamydia.
Other infections where appropriate.

The types of samples required depend on individual exposure history.

What Happens During a PrEP Medical Consultation?

A PrEP consultation generally involves several stages.

Step 1: Review of Medical and Sexual Health History

The doctor will discuss relevant medical conditions, previous HIV tests, potential exposure history and current medications.

Step 2: Assessment of HIV Prevention Needs

The consultation helps establish whether PrEP is clinically indicated or whether another preventive or diagnostic approach may be more appropriate.

Step 3: Baseline Testing

HIV testing and other blood or STI tests may be arranged as required.

Step 4: Discussion of Appropriate Prevention Options

Where PrEP is suitable, the doctor will explain the proposed regimen, adherence requirements, potential side effects and precautions.

Step 5: Ongoing Review

Patients prescribed PrEP require regular follow-up to assess HIV status, medication use and relevant safety considerations.

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How Effective Is PrEP Against HIV?

PrEP can substantially reduce the risk of HIV infection when taken correctly.

Research has shown that adherence to the prescribed regimen is one of the most important factors affecting protection.

Protection may be reduced when:

Doses are missed.
Medication is started too close to potential exposure.
An event-driven schedule is not followed correctly.
Treatment is interrupted without appropriate planning.

PrEP should be viewed as one component of HIV prevention rather than a guarantee against infection.

It does not replace regular HIV testing, appropriate STI screening or other preventive measures.

Are There Side Effects From PrEP?

Like other prescription medicines, oral PrEP can cause side effects.

Not everyone experiences them, and their severity varies.

Temporary Side Effects

Possible symptoms include nausea, headache, abdominal discomfort and diarrhoea.

Some side effects may improve after the initial period of medication use.

Patients should inform their doctor if symptoms are persistent or troublesome.

Effects on Kidney Function

Certain oral PrEP regimens can affect kidney function.

For this reason, kidney function is assessed before treatment and monitored when clinically indicated.

Effects on Bone Mineral Density

Some oral PrEP medicines may cause small reductions in bone mineral density.

Patients with relevant bone health concerns should discuss these with their doctor.

Special Considerations for Hepatitis B

Certain PrEP medications also suppress hepatitis B activity.

Stopping these medicines in a person with chronic hepatitis B can lead to worsening liver inflammation.

Such patients require appropriate medical supervision.

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How Often Is HIV Testing Required While Taking PrEP?

Regular testing is an essential part of PrEP care.

Patients taking oral PrEP are generally advised to undergo repeat HIV testing approximately every three months.

The doctor may also recommend:

STI screening every three to six months, depending on exposure risk.
Periodic kidney function testing.
Hepatitis testing where clinically appropriate.
Review of side effects and adherence.
Reassessment of whether PrEP remains necessary.

Follow-up frequency may vary depending on individual health and the prescribed regimen.

What Is the Difference Between PrEP and PEP?

Although PrEP and PEP both involve antiretroviral medication, they serve different purposes.

PrEP is used before potential HIV exposure. It is considered for people who may face ongoing or anticipated exposure.

PEP is used after a possible HIV exposure. It is a time-sensitive preventive treatment that should be assessed and started as soon as possible when indicated, within 72 hours of exposure.

PEP generally involves a 28-day course of prescribed medication.

People who have recently had a potential HIV exposure should seek urgent medical advice rather than attempting to start PrEP independently.

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Can You Take PrEP After Completing PEP?

Patients who have completed HIV PEP may sometimes benefit from transitioning to PrEP if they continue to face potential HIV exposure.

A doctor will review the circumstances of the previous exposure, HIV testing results and whether ongoing prevention is appropriate.

Further testing may be necessary before or during the transition.

The timing and medication regimen should be determined by the prescribing doctor.

Can PrEP Be Used Long-Term?

PrEP may be used during periods when HIV prevention is clinically appropriate.

Some individuals may require it for extended periods, while others may only need it during particular stages of life.

Continued use depends on:

Ongoing HIV prevention needs.
Medication adherence.
HIV testing results.
Kidney function and other health considerations.
Patient preferences.
The doctor’s clinical assessment.

Patients should discuss any plans to discontinue or restart PrEP with their doctor.

Can PrEP Replace Condoms?

No. PrEP does not provide protection against other sexually transmitted infections such as gonorrhoea, chlamydia and syphilis.

It also does not prevent pregnancy.

Condoms, STI screening, vaccinations where appropriate and regular sexual health consultations may remain important.

A combination of preventive measures can help address different sexual health risks.

HIV Prevention and Sexual Health Consultation at Kensington Family Clinic

Kensington Family Clinic provides HIV testing and sexual health services in Singapore.

Patients who would like to understand their HIV prevention options can discuss their circumstances with a doctor and undergo appropriate testing.

The clinic provides HIV and STI screening, including MOH-approved anonymous HIV testing services.

The arrangements for anonymous HIV testing are distinct from those for prescription consultations and medical monitoring, which may require patient identification and medical records.

For enquiries about PrEP assessment and related services, please contact Kensington Family Clinic.

Frequently Asked Questions About HIV PrEP in Singapore

1. What does PrEP stand for?

PrEP stands for Pre-Exposure Prophylaxis. It refers to preventive medication used before potential HIV exposure to reduce the risk of infection.

2. Is PrEP suitable for heterosexual individuals?

Daily oral PrEP may be suitable for heterosexual individuals whose circumstances indicate a need for HIV prevention. Eligibility depends on medical assessment.

3. Can women take PrEP?

Yes. Certain daily oral PrEP regimens may be suitable for eligible women. On-demand 2-1-1 PrEP is not recommended for vaginal exposure.

4. Can PrEP prevent HIV completely?

No. PrEP substantially reduces HIV risk when used correctly, but it does not guarantee complete protection.

5. Is PrEP effective immediately?

No. Oral PrEP requires time to reach protective medication levels. The timeframe varies by regimen and exposure type.

6. Do I need regular blood tests?

Yes. HIV testing is required before starting PrEP and regularly during use. Kidney function and other tests may also be necessary.

7. Can I take PrEP if my HIV test is negative?

A negative HIV test is necessary but not the only eligibility requirement. Your doctor must also consider recent exposure, kidney health, hepatitis status and other relevant factors.

8. Can PrEP affect my kidneys?

Certain oral PrEP medicines may affect kidney function. Blood tests help doctors assess suitability and monitor for changes.

9. Can I drink alcohol while taking PrEP?

Alcohol does not generally have a direct interaction with commonly used oral PrEP medication, but excessive drinking may interfere with medication adherence and other aspects of health.

10. Can I take PrEP with other medication?

Some medicines may affect the suitability or safety of a PrEP regimen. Inform your doctor about all prescription medicines, over-the-counter products and supplements you use.

11. Can I take PrEP if I am planning a pregnancy?

PrEP may be considered in certain circumstances during conception planning or pregnancy. A doctor should assess the benefits, risks and suitability of the particular regimen.

12. Is on-demand PrEP suitable for everyone?

No. Event-driven PrEP is intended only for selected eligible individuals and is not recommended for all types of HIV exposure.

13. What if I forget to take PrEP?

The appropriate action depends on the prescribed regimen, when the dose was missed and whether potential exposure occurred. Seek advice from your doctor rather than changing the regimen independently.

14. Does PrEP protect against gonorrhoea and syphilis?

No. PrEP is specifically intended to reduce the risk of HIV infection. Separate preventive measures and screening are needed for other STIs.

15. Do I need to take PrEP for the rest of my life?

Not necessarily. PrEP may be used during periods of increased HIV exposure risk. The timing of discontinuation should be discussed with a doctor.

16. Can I get PrEP without consulting a doctor?

PrEP requires a medical assessment and prescription. HIV testing and other investigations are necessary to establish whether it is appropriate.

17. What is the cost of PrEP in Singapore?

Costs vary according to the consultation, prescribed regimen, baseline investigations and ongoing monitoring requirements. Patients should enquire directly about applicable charges.

18. What should I do if I have had a possible HIV exposure within 72 hours?

Seek urgent medical assessment for HIV PEP. PrEP should not be used as a substitute for time-sensitive post-exposure treatment.

Medical Disclaimer

This page provides general educational information about HIV prevention and PrEP. It is not intended as a substitute for personalised medical advice. PrEP requires a prescription, appropriate testing and ongoing medical supervision. Suitability and treatment decisions must be determined by a qualified medical practitioner.