Tadalafil: Complete Guide for Filipino Men
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Tadalafil is a prescription medicine for erectile dysfunction (ED) and, at 5mg daily, for urinary symptoms of an enlarged prostate (BPH). It stays active in the body for up to 36 hours. In the Philippines you need a doctor's prescription. Online, NowExpress lists Cialis 20mg x 2 tablets at around ₱2,500 and Thafil 10mg at around ₱1,600 (October 2026).
Start your free assessment or see Cialis (tadalafil) and Thafil 10 (tadalafil) on NowExpress. Prices can change; the product page shows the current price.
How does tadalafil work?
Tadalafil is a PDE5 inhibitor, the same drug class as sildenafil (Viagra). The mechanism is the same at the molecular level: during sexual arousal, nitric oxide triggers the production of cyclic GMP (cGMP) in penile tissue, which relaxes blood vessels and allows blood flow. PDE5 is the enzyme that breaks cGMP down. Tadalafil blocks PDE5, allowing cGMP to accumulate, which sustains the erection.
Sexual stimulation is still required. Tadalafil does not create erections spontaneously. It enhances your body's natural arousal response. Without stimulation, nothing happens.
So if the mechanism is the same as sildenafil, why does tadalafil last so much longer?
How long does tadalafil last?
Tadalafil stays active in the body for up to 36 hours after a single dose. Here is why.
The answer is pharmacokinetics: how the body absorbs, distributes, and eliminates the drug.
Half-life: Tadalafil has a half-life of approximately 17.5 hours, compared to a label half-life of about 4 hours for sildenafil. This means tadalafil stays in your bloodstream at clinically meaningful levels for much longer.
Peak plasma concentration: Tadalafil reaches peak levels about 2 hours after dosing (range: 30 minutes to 6 hours). This is slightly slower than sildenafil's median of 1 hour, which is why some men feel tadalafil takes a bit longer to "kick in."
Duration: Tadalafil stays active in the body for up to 36 hours after a single dose. This is not a 36-hour erection. Sexual stimulation is still needed.
Food interaction: Unlike sildenafil, tadalafil absorption is not significantly affected by food. You can take it with a full meal, a light snack, or on an empty stomach.
Alcohol interaction: Moderate alcohol does not significantly affect tadalafil's pharmacokinetics. However, excessive alcohol impairs erectile function on its own, which works against the medication.
Can I take tadalafil every day?
Yes, if your doctor prescribes it. Low-strength tadalafil (2.5mg or 5mg) is FDA-approved for daily use, and higher strengths (10mg or 20mg) are used as needed. The label describes these two approaches; your doctor decides which one suits you.
As-Needed Dosing (10mg or 20mg)
As-needed use means one tablet before sexual activity, as your doctor directs. Because tadalafil stays active in the body for up to 36 hours, timing is less tight than with sildenafil.
10mg is the usual starting strength on the label for as-needed use. Your doctor decides if a different strength is right for you.
20mg is the highest single-dose strength on the label.
The label maximum is one dose in 24 hours. Your doctor sets the dose and the timing.
Daily Dosing (2.5mg or 5mg)
Daily use means one tablet at the same time each day, as your doctor directs, regardless of when you plan to have sex. After 4 to 5 days of consistent use, tadalafil reaches a steady level in your blood.
2.5mg and 5mg are the daily strengths on the label. Your doctor decides which one is right for you.
As-needed or daily: how do they differ?
| Factor | As-Needed (10-20mg) | Daily (2.5-5mg) |
|---|---|---|
| Planning needed | Minimal (onset is about 30 min to 2 hours; the 36-hour window gives flexibility) | None |
| Cost per month | Lower if infrequent use | Higher total cost, but can work out closer per dose with frequent use |
| Side effects | Higher peak drug levels = potentially more noticeable | Lower steady-state levels |
| Spontaneity | Flexible (active up to 36 hours) | Always present in the body |
| BPH benefit | None | Yes (5mg daily is also approved for BPH symptoms) |
Your doctor decides whether as-needed or daily use suits you.
Is tadalafil used for an enlarged prostate (BPH)?
Yes. Tadalafil 5mg daily is FDA-approved for treating the urinary symptoms of benign prostatic hyperplasia (BPH).
BPH is commonly known as an enlarged prostate.
BPH symptoms include frequent urination, urgency, weak stream, difficulty starting urination, and waking up multiple times at night to urinate. These symptoms are extremely common in men over 50.
The same PDE5 inhibition that improves erectile function also relaxes smooth muscle in the prostate and bladder. Studies have looked at daily tadalafil 5mg for both ED and BPH symptoms.
For men who have both ED and urinary symptoms, which is a common combination as men age, ask your doctor whether daily tadalafil is an option.
Who should not take tadalafil?
The contraindications are the same as other PDE5 inhibitors, with one additional note about the longer duration.
Absolute contraindications:
- Nitrate medications (nitroglycerin, isosorbide mononitrate, isosorbide dinitrate, recreational nitrites/"poppers"). This combination can cause fatal hypotension. Because tadalafil stays active in the body for up to 36 hours, the interaction window is much longer than with sildenafil. If you take tadalafil and then need nitrates for a heart event, tell the medical team that you took tadalafil and when.
- Riociguat (for pulmonary hypertension)
- Medical advice to avoid sexual activity due to cardiovascular risk
Use with caution (requires medical evaluation):
- Heart disease, heart failure, unstable angina, recent heart attack or stroke
- Low blood pressure or uncontrolled high blood pressure
- Liver or kidney impairment (your doctor may adjust the dose)
- Conditions predisposing to priapism (sickle cell disease, multiple myeloma, leukemia)
- Peyronie's disease or anatomical penile deformities
- Retinitis pigmentosa or hereditary retinal disorders
Drug Interactions
Tadalafil is metabolized by the CYP3A4 enzyme system in the liver. Medications that inhibit or induce CYP3A4 can alter tadalafil's levels in your body.
Strong CYP3A4 inhibitors (your doctor may adjust or avoid): - HIV protease inhibitors (ritonavir, saquinavir, atazanavir): Your doctor may adjust the dose or advise against the combination. - Azole antifungals (ketoconazole, itraconazole)
CYP3A4 inducers (may lessen tadalafil's effect): - Rifampicin (tuberculosis treatment) - Phenytoin, carbamazepine (seizure medications) - These medications speed up tadalafil metabolism, potentially reducing its effect.
Alpha-blockers: Used for BPH (tamsulosin, doxazosin) or hypertension. Combining with tadalafil can cause additive blood pressure reduction. If you are on an alpha-blocker, your doctor may adjust the dose and monitor you.
Other PDE5 inhibitors: Do not combine tadalafil with sildenafil, vardenafil, or avanafil. No additional benefit, increased risk.
Antihypertensives: Tadalafil can add to the blood pressure-lowering effect of antihypertensive medications. Usually manageable, but worth monitoring.
What are the side effects of tadalafil?
Tadalafil's side effect profile is similar to other PDE5 inhibitors, with a few differences related to its longer duration.
Common: - Headache - Indigestion or dyspepsia - Back pain - Muscle aches (myalgia) - Facial flushing - Nasal congestion
Back pain and muscle aches are more commonly reported with tadalafil than sildenafil. They typically appear 12 to 24 hours after the dose and resolve within 48 hours. The longer half-life likely contributes to this pattern.
Rare but serious (seek immediate medical attention): - Priapism (erection lasting more than 4 hours) - Sudden vision loss - Sudden hearing loss - Chest pain during sexual activity
Is generic tadalafil the same as Cialis?
Generic tadalafil contains the same active ingredient at the same strength, made to the same regulatory standards. Bioequivalence is a requirement for generic approval, meaning the drug is absorbed in the body at the same rate and extent as the branded version.
In the Philippines: Branded Cialis (made by Eli Lilly) is around ₱2,500 for 2 tablets of 20mg at NowExpress (October 2026). Generic tadalafil is usually priced lower. Prices can change; the Cialis product page shows the current price.
For Cialis as a brand in the Philippine market, including daily vs as-needed use, see our Cialis Philippines guide.
Tadalafil and sildenafil are both prescription ED medicines. They differ in how long they stay active, per the label: up to 36 hours for tadalafil and up to about 4 hours for sildenafil. Your doctor helps you choose. For more, see Cialis vs. Viagra.
How do I get tadalafil in the Philippines?
You need a prescription from a licensed doctor. Tadalafil is not sold over the counter.
In-person: See a urologist, internist, or GP. They will assess your condition, check for contraindications, and write a prescription if appropriate. Fill it at any licensed pharmacy.
Online through NowExpress: NowExpress is an online pharmacy in the Philippines with an FDA License to Operate. It is LegitScript-certified, a licensed doctor reviews every order, and it delivers nationwide. Complete the health assessment (about 5 minutes); the initial assessment is free. If approved, choose your tadalafil product. Medication ships in discreet, unmarked packaging. Genuine Cialis (made by Eli Lilly) is bought through the official Philippine import chain and dispensed by a licensed pharmacist.
Avoid unregulated sellers. Unverified sellers on online marketplaces and social media may sell products of unknown origin. Look for an FDA License to Operate, a real doctor review, and a licensed pharmacist. If a seller does not require a prescription, that is a red flag.
Visit our tadalafil page for options, see Cialis (tadalafil) or Thafil 10 (tadalafil) for current prices, or browse our ED treatment overview. Prices can change; the product page shows the current price.
Frequently Asked Questions
How long does tadalafil stay in your system?
Tadalafil's half-life is about 17.5 hours, meaning the drug reaches half its original concentration in that time. It stays active in the body for up to 36 hours. The drug is essentially cleared from your system within 4 to 5 days.
Can I take tadalafil every day?
Yes, if your doctor prescribes it. The 2.5mg and 5mg strengths are FDA-approved for daily use. After about 5 days of consistent daily use, the drug reaches a steady level in the body, so there is no need to time a pill around sexual activity.
Is tadalafil stronger than sildenafil?
They work through the same mechanism. Tadalafil is not "stronger." It stays active longer and has a different side effect profile. Your doctor decides which one suits you.
Can I split a 20mg tablet for daily use?
This is not medically recommended without your doctor's guidance. The 5mg daily and 20mg as-needed formulations may differ in how they are manufactured. Splitting may result in uneven dosing. Talk to your doctor about the proper daily formulation.
Does tadalafil work immediately?
No. Like all PDE5 inhibitors, tadalafil requires sexual stimulation to work. Onset is usually about 30 minutes to 2 hours, and your doctor advises on timing. Because tadalafil stays active in the body for up to 36 hours, exact timing is less tight than with sildenafil. For daily use, the drug builds up over 4 to 5 days.
Can I drink alcohol with tadalafil?
Alcohol can add to dizziness and low blood pressure; ask your doctor.
Is tadalafil safe for men with high blood pressure?
Tadalafil can be used by men with controlled high blood pressure, but your doctor needs to review your medications first. The combination with alpha-blockers or multiple antihypertensives requires careful dose adjustment. Tadalafil is not safe for men with uncontrolled hypertension or very low blood pressure.
What about tadalafil for women?
Tadalafil is not approved for use in women. Some studies have explored its use for female sexual dysfunction and pulmonary hypertension in women, but these are not established indications. This guide applies to adult men only.
If you'd rather do this online, Start your free assessment and a licensed doctor will review it, or see Cialis (tadalafil) and Thafil 10 (tadalafil). Approved orders ship discreetly nationwide. Prices can change; the product page shows the current price.
This guide is for informational purposes. Tadalafil is a prescription medication. Consult a licensed doctor before use. Only for the treatment of conditions diagnosed by a physician.