Erectile Dysfunction (ED) is a common condition where a man has difficulty getting or maintaining an erection firm enough for sexual activity. While occasional erection problems can happen due to stress, fatigue, or lack of sleep, persistent ED may be related to underlying medical or psychological causes.
ED can affect men of all ages and may be associated with:
- Stress and anxiety
- Diabetes
- High blood pressure
- High cholesterol
- Obesity
- Smoking
- Poor sleep
- Hormonal issues
- Medication side effects
The good news is that ED is treatable, and oral medications are often one of the first treatment options doctors recommend.
Oral Erectile Dysfunction Medications Available in Singapore
Several oral medications are available in Singapore for ED treatment. These medications belong to a group called PDE5 inhibitors.
Commonly prescribed medications include:
- Viagra (sildenafil)
- Cialis (tadalafil)
- Levitra (vardenafil)
- Stendra (avanafil)
Among these, Viagra and Cialis remain the most widely recognised and commonly prescribed ED medications.
Both medications are effective, but they differ in terms of duration, flexibility, and how they fit into different lifestyles.
How Do Erectile Dysfunction Medications Work?
ED medications such as sildenafil and tadalafil work by increasing blood flow to the penis.
They belong to a group of medications known as PDE5 inhibitors. These medications help relax blood vessels in the penis, making it easier to achieve and maintain an erection during sexual stimulation.
It is important to understand that:
- These medications do not automatically cause an erection
- Sexual stimulation is still required
- They are not aphrodisiacs and do not directly increase sexual desire
- They do not permanently cure erectile dysfunction
Instead, they help improve the body’s natural erectile response.
Similarities Between Viagra and Cialis
Viagra and Cialis share many similarities.
Both medications:
- Belong to the PDE5 inhibitor group
- Improve blood flow to the penis
- Require sexual stimulation to work
- Effective for many men with ED
- Have similar side effects such as headache and facial flushing
- Should not be combined with nitrate medications
- Require a proper medical assessment before use
For many patients, both medications can work well. The choice often depends on lifestyle, preference, frequency of sexual activity, and how long the medication lasts.
Viagra vs Cialis: What’s the Difference?
A. Onset of Action
Viagra (Sildenafil)
Viagra usually starts working within 30 to 60 minutes.
It is generally recommended to take Viagra on an empty stomach because heavy meals, especially fatty meals, can delay absorption and reduce effectiveness.
Cialis (Tadalafil)
Cialis also usually starts working within about 30 to 60 minutes.
Unlike Viagra, Cialis is less affected by food intake, which some men find more convenient.
B. Duration of Action
One of the biggest differences between Viagra and Cialis is how long they last.
Viagra
- Usually lasts around 4 to 6 hours
Cialis
- Can remain effective for up to 36 hours
Because of its long duration, Cialis is sometimes referred to as the “weekend pill.”
Many men prefer Cialis because it allows greater spontaneity and less pressure to plan intercourse around medication timing.
C. Daily vs On-Demand Use
Viagra
Viagra is usually taken only when needed before sexual activity.
Cialis
Cialis comes in two different forms:
1. Daily Cialis
Low-dose tadalafil is taken once daily regardless of sexual activity.
Common doses include:
- 2.5 mg daily
- 5 mg daily
Benefits of daily Cialis:
- Allows spontaneous sexual activity
- No need to time medication before intercourse
- Useful for men with more frequent sexual activity
2. On-Demand Cialis
Higher-dose tadalafil can also be taken only when needed before sexual activity.
Common doses include:
- 10 mg
- 20 mg
This provides flexibility while still offering a long duration of action.
D. Food Interaction
Viagra
Heavy meals may delay absorption and reduce effectiveness.
Cialis
Less affected by food intake.
This makes Cialis more convenient for some patients.
E. Side Effects
Both medications can cause:
- Headache
- Facial flushing
- Nasal congestion
- Indigestion
- Dizziness
However, there are some differences.
Viagra
More commonly associated with:
- Temporary visual disturbances
- Blue-tinted vision
Cialis
More commonly associated with:
- Muscle aches
- Back pain
Most side effects are mild and temporary.
F. Cost
The cost of ED medications varies depending on:
- Brand vs generic medication
- Dosage
- Frequency of use
- Daily vs on-demand treatment
In general:
- Generic sildenafil is often more affordable
- Tadalafil may cost slightly more per tablet
- Daily Cialis may cost more over time because it is taken every day
However, many men feel the added flexibility and spontaneity are worth the additional cost.
Quick Comparison Table
| Feature | Viagra (Sildenafil) | Cialis (Tadalafil) |
|---|---|---|
| Onset of Action | 30–60 minutes | 30–60 minutes |
| Duration | 4–6 hours | Up to 36 hours |
| Food Effect | Affected by heavy meals | Minimal food effect |
| Daily Option | No | Yes |
| Usual Use | On-demand | Daily or on-demand |
| Best For | Planned occasional use | Greater spontaneity |
| Common Side Effects | Headache, flushing, visual changes | Headache, flushing, back pain |
So, Which Is Better?
There is no single “best” medication for everyone.
Viagra may be suitable if:
- You use ED medication occasionally
- You prefer a shorter-acting medication
- Cost is an important consideration
- You are comfortable planning ahead
Cialis may be suitable if:
- You want greater spontaneity
- You have more frequent sexual activity
- You prefer a longer-lasting medication
- You are interested in a daily treatment option
Different men respond differently to each medication. Some patients may also tolerate one medication better than the other.
A doctor can help determine which option is safer and more suitable based on your medical history and lifestyle.
How to Take Erectile Dysfunction Medication
How to Take Viagra
Viagra is usually taken:
- About 30 to 60 minutes before sexual activity
- On an empty stomach for the best effect
- No more than once daily
Excessive alcohol may reduce effectiveness and increase side effects.
How to Take Cialis
Cialis can be taken:
- With or without food
- Either daily or on demand
- At least 30 minutes before intercourse for on-demand use
Daily Cialis should be taken around the same time every day.
Always follow your doctor’s instructions regarding dosage and frequency.
When Should You Avoid These Medications?
ED medications may not be suitable for everyone.
You should inform your doctor if you have:
- Heart disease
- Recent heart attack or stroke
- Severe low blood pressure
- Liver disease
- Kidney disease
- Certain eye conditions
- Chest pain requiring nitrate medications
Taking PDE5 inhibitors together with nitrates can cause dangerous drops in blood pressure.
A proper medical assessment is important before starting treatment.
How We Can Help
At GoMed, we provide confidential online consultations for erectile dysfunction in Singapore.
Our doctors can help with:
- Assessment of your erectile dysfunction symptoms
- Discussion of possible underlying causes
- Counselling on medication side effects and proper usage
- Prescription of suitable ED medication when appropriate
- Discreet delivery of medication to your doorstep
Online teleconsultation allows patients to seek treatment privately and conveniently from home.
The Bottom Line
Both Viagra and Cialis are effective treatments for erectile dysfunction.
- Viagra is shorter-acting and often more affordable
- Cialis lasts longer and offers greater spontaneity
- Cialis is also available as a daily medication option
The best choice depends on your lifestyle, medical history, frequency of sexual activity, and personal preference.
If you are unsure which medication is suitable for you, a consultation with a doctor can help guide you safely.
Frequently Asked Questions on sildenafil and tadalafil
Do generic sildenafil and tadalafil work the same way?
Generic sildenafil and tadalafil contain the same active ingredients as the branded versions and are generally effective when prescribed by licensed doctors and obtained from reliable sources.
Are erectile dysfunction medications available over the counter in Singapore?
No. ED medications require a doctor’s prescription in Singapore.
This is important because some patients may have underlying medical conditions that require further assessment before starting treatment.
Can I take erectile dysfunction medication daily?
Daily low-dose tadalafil (Cialis) is specifically designed for daily use in suitable patients.
Sildenafil (Viagra) is usually taken only when needed unless otherwise advised by a doctor.
Can I switch between Viagra and Cialis?
Some men may switch between medications depending on effectiveness, side effects, lifestyle preference, or duration of action.
However, medication changes should be discussed with a doctor first.
Do these medications increase sexual desire?
No. These medications improve blood flow and erections but do not directly increase libido or sexual desire.
Sexual stimulation is still required for the medications to work.
What if the medication does not work the first time?
It is not uncommon for ED medication to require several attempts before achieving the desired effect.
Possible reasons include:
- Incorrect timing
- Heavy meals
- Alcohol intake
- Anxiety
- Inadequate sexual stimulation
- Incorrect dosage
A doctor may adjust the dose or recommend a different medication if needed.
References
- American Urological Association (AUA) Guidelines on Erectile Dysfunction
- European Association of Urology (EAU) Guidelines on Sexual and Reproductive Health
- NHS UK – Sildenafil and Tadalafil
- Mayo Clinic – Erectile Dysfunction Overview
- Singapore HealthHub – Erectile Dysfunction Information