Daily Tadalafil vs As Needed: How the Two Approaches Compare

Daily tadalafil vs as needed comes down to one long-acting medication used two ways. Daily use means a lower amount taken every day, which keeps a steady level in the body so sex isn't timed around a pill. As-needed use means a higher amount taken before sexual activity. Research shows no clear winner on effectiveness. Only daily use is FDA-labeled for enlarged-prostate (BPH) symptoms, and a licensed clinician decides which approach, if either, fits.

Key takeaways

• Tadalafil's mean half-life of 17.5 hours is what lets the same medication be used daily or as needed.
• The American Urological Association (AUA) guideline says daily and on-demand tadalafil appear about equally effective, and a meta-analysis that favored daily dosing was publicly challenged.
• Only once-daily use is FDA-labeled for the symptoms of benign prostatic hyperplasia (BPH), alone or together with erectile dysfunction (ED).
• Tadalafil must never be combined with nitrate medications, including recreational "poppers", on either schedule.
• Daily use keeps tadalafil in your blood continuously, so kidney function and other medications weigh more heavily, which is one reason a licensed clinician makes the call.

Daily tadalafil vs as needed at a glance

The two schedules share an active ingredient but differ in planning, labeled uses and how long the drug stays in your blood (FDA Cialis label, 2018).

On either schedule, tadalafil needs sexual stimulation to work, and it does not increase sexual desire or cure ED (FDA Cialis label, 2018). For background on the drug itself, see tadalafil for men's health: how it works and what to know.

Tadalafil half-life: why one drug can work both ways

Tadalafil stays in the body much longer than most ED medications. Its mean terminal half-life is 17.5 hours, which is what makes both schedules possible (FDA Cialis label, 2018).

Half-life is the time it takes for the amount of a drug in the blood to fall by half. After a single dose, tadalafil peaks in the blood at a median of about 2 hours, and some of it remains in the body for more than 2 days (FDA Cialis label, 2018). That long tail explains two label findings:

• As needed: in label trials, tadalafil improved erectile function compared with placebo for up to 36 hours after a dose. That is a trial result, not a prediction of what any one person will experience (FDA Cialis label, 2018).
• Daily: blood levels reach steady state, the point where the amount absorbed each day roughly balances the amount cleared, within about 5 days (FDA Cialis label, 2018).

PDE5 inhibitors (phosphodiesterase type 5 inhibitors) are the ED drug class that includes sildenafil, tadalafil, vardenafil and avanafil (AUA, 2018). A 2008 review noted that tadalafil's longer half-life allows a steady blood level with low-dose once-daily use, unlike the other two PDE5 inhibitors it covered (Therapeutics and Clinical Risk Management, 2008). Only tadalafil is FDA-approved for daily dosing (AUA, 2018).

Does daily tadalafil work better than as needed?

No clear winner has emerged. The AUA guideline says on-demand and daily tadalafil appear to produce the same level of efficacy, and a meta-analysis that favored daily dosing was challenged in a published letter.

The Zhou meta-analysis pooled 4 randomized trials of about 1,035 men treated for at least 24 weeks and concluded daily dosing worked better with fewer side effects. The odds of any side effect were lower with daily use, but stopping due to side effects and specific side effects did not differ significantly (Sexual Medicine, 2019). A 2020 letter said the paper's forest plots showed the opposite of the reported direction of effect (Sexual Medicine, 2020). The Zhou paper also cites an earlier study in which daily use gave no clinically significant gain over on-demand use after 12 weeks on the IIEF-EF, the erectile function score of the International Index of Erectile Function questionnaire (Sexual Medicine, 2019).

For long-term use, Porst and colleagues followed men on the once-daily regimen for up to 2 years in open-label extensions and saw no study drug-related serious adverse events (Journal of Sexual Medicine, 2008). The limits: everyone knew they were taking the drug, there was no placebo group, and only 58.4% finished the 2-year extension.

The honest reading: both schedules beat placebo, and neither has a proven edge for ED alone. The choice mostly turns on your health, other conditions and preference.

Daily tadalafil for BPH symptoms

Daily use is the schedule tied to BPH. The Cialis label covers BPH symptoms, and ED plus BPH, with once-daily use only (FDA Cialis label, 2018).

BPH is noncancerous enlargement of the prostate. It can cause frequent urination, a weak stream or waking at night to urinate. Trials measured symptoms with the IPSS (International Prostate Symptom Score), a standard urinary symptom questionnaire where higher scores mean worse symptoms.

In two 12-week randomized, placebo-controlled trials, the once-daily regimen lowered total IPSS more than placebo: -4.8 vs -2.2 in one study and -5.6 vs -3.6 in the other. In men with both ED and BPH, daily use improved IPSS (-6.1 vs -3.8) and IIEF-EF (+6.5 vs +1.9). Maximum urinary flow rate did not differ significantly from placebo (FDA Cialis label, 2018). The AUA notes that studies of men with BPH-related urinary symptoms plus ED used daily dosing because of this drug class's beneficial urinary effects (AUA, 2018).

Screening matters. The label says other urological conditions that cause similar symptoms should be considered before BPH treatment, and it does not recommend combining tadalafil with alpha-blockers, a common class of BPH medications, for BPH treatment (FDA Cialis label, 2018).

Tadalafil side effects on either schedule

The most common side effects are headache, indigestion, back pain, muscle aches, nasal congestion, flushing and limb pain, each reported in 2% or more of people in label trials (FDA Cialis label, 2018).

Back pain and muscle aches generally start 12 to 24 hours after a dose and typically resolve within 48 hours (FDA Cialis label, 2018). Tadalafil tended to have higher rates of these than other PDE5 inhibitors (AUA, 2018). For daily vs as-needed tolerability, the label warns that rates from different trials can't be directly compared; the closest head-to-head data is the challenged Zhou analysis above.

Rare but serious events need immediate action:

• An erection lasting more than 4 hours: seek emergency care.
• Sudden loss of vision or hearing: stop and seek medical care right away (FDA Cialis label, 2018).
• Chest pain during sex: seek emergency care.

If a side effect bothers you or persists, contact your clinician rather than changing how you take tadalafil. Follow your clinician's guidance and pharmacy instructions.

Who should not take tadalafil

Anyone who uses nitrate medications should not take tadalafil. Tadalafil must not be combined with nitrates, regular or occasional, including nitroglycerin and recreational "poppers" such as amyl or butyl nitrite (FDA Cialis label, 2018). Together they can drop blood pressure to unsafe levels. If you take tadalafil and ever need emergency care, tell the medical team, because the label sets a waiting period before treating clinicians can give a nitrate.

The label also contraindicates guanylate cyclase stimulators such as riociguat and known serious hypersensitivity to tadalafil. On heart health, tadalafil is not for men whose cardiovascular status makes sex inadvisable, including a recent heart attack, unstable angina or angina during intercourse, significant recent heart failure, uncontrolled arrhythmias, or very low or uncontrolled high blood pressure (FDA Cialis label, 2018).

Kidney and liver function set limits too. Daily use is not recommended with severely reduced kidney function (low creatinine clearance, a measure of kidney filtering) or with hemodialysis, and use is not recommended with severe liver impairment (FDA Cialis label, 2018).

Daily use adds one more consideration. The label notes that once-daily use provides continuous blood levels, which prescribers should weigh for interactions with alpha-blockers, other blood pressure medications, potent CYP3A4 inhibitors and substantial alcohol (FDA Cialis label, 2018). CYP3A4 is a liver enzyme that breaks down many drugs; its inhibitors include certain antifungals, HIV medications and antibiotics.

How a clinician weighs daily vs as-needed

A licensed clinician chooses based on your health and goals, not on marketing. These are the main factors:

1. How spontaneously you want treatment available. With daily use, dosing and sex no longer need to be linked in time (Journal of Sexual Medicine, 2008).
2. Whether you also have urinary symptoms consistent with BPH.
3. Kidney and liver function, which can rule out daily use or limit use.
4. Your full medication list, including nitrates, alpha-blockers, blood pressure drugs and CYP3A4 inhibitors.
5. Past side effects and how much you drink.
6. Whether the issue is erections or desire. Tadalafil does not increase desire, and low desire may call for a different conversation, such as evaluating low testosterone.

Questions worth bringing to your clinician:

• Given my medications, is either schedule safe for me?
• Do my urinary symptoms need separate evaluation first?
• Which side effects should prompt a call?

Not everyone qualifies. Eligibility depends on your intake and clinical review, and that's how it should work.

How access works through New Blue

New Blue offers two tadalafil formats, each available only if a licensed clinician decides it is appropriate.

• Tadalafil 5 mg daily: a daily tablet. Tadalafil is the active ingredient in Cialis, which is FDA-approved for ED and BPH symptoms. See the Tadalafil 5 mg daily treatment page.
• Tadalafil 20 mg troche, as needed: a lozenge that dissolves in the mouth. Compounded medications, including this troche, are not FDA-approved. They are prepared by state-licensed 503A compounding pharmacies or FDA-registered 503B outsourcing facilities; see the compounding disclosure and the Tadalafil 20 mg troche treatment page. The Cialis trials above studied swallowed brand tablets, so their results can't be assumed to apply to a compounded troche.

The process:

1. Complete an asynchronous intake, a structured health questionnaire covering your symptoms, heart health and medications.
2. A licensed clinician reviews it. Some treatments or states may require a live visit. Consultation timing varies by clinician availability.
3. If prescribed, a licensed partner pharmacy ships the medication directly to you.

New Blue is a technology and administrative services platform. Medical services are provided by independent licensed clinicians; medications are dispensed only if prescribed. Availability varies by state; check state availability. Care is for adults 21 and older and is not for emergencies. For current pricing, see each treatment page. If treatment isn't appropriate, refunds follow our refund policy.

Frequently Asked Questions

Can I switch between daily and as-needed tadalafil?

Only with your clinician's guidance. Changing schedules on your own, or combining tadalafil with other ED medicines, is not something to improvise. A licensed clinician can review whether a change makes sense for your health and medications.

Does daily tadalafil raise testosterone or sex drive?

No. Tadalafil does not increase sexual desire, and it works only with sexual stimulation. It is not a testosterone treatment. If low desire is the main concern, a clinician may consider evaluating testosterone levels instead.

Is daily tadalafil safe long term?

Long-term data are encouraging but limited. Open-label extensions lasting up to 2 years found the once-daily regimen well tolerated, with no study drug-related serious adverse events. Those studies had no placebo group, so regular check-ins matter as your health and medications change.

Can I take tadalafil if I use nitroglycerin or poppers?

No. Tadalafil must not be combined with any nitrate medication, regular or occasional, including nitroglycerin and recreational poppers. This applies to both daily and as-needed use. If you take tadalafil and need emergency care, tell the medical team.

Is daily tadalafil the only option for BPH symptoms?

Among tadalafil schedules, only once-daily use is FDA-labeled for BPH symptoms, alone or with ED. Urinary symptoms can come from other conditions, so they need evaluation first. A licensed clinician decides whether tadalafil is appropriate.

Sources

1. CIALIS (tadalafil) tablets, for oral use: Full Prescribing Information and Patient Information (Revised 02/2018). U.S. Food and Drug Administration (Drugs@FDA label, Eli Lilly and Company), 2018. https://www.accessdata.fda.gov/drugsatfda_docs/label/2018/021368s030lbl.pdf
2. Erectile Dysfunction: AUA Guideline. Journal of Urology, 2018. https://doi.org/10.1016/j.juro.2018.05.004
3. Meta-Analysis of the Long-Term Efficacy and Tolerance of Tadalafil Daily Compared With Tadalafil On-Demand in Treating Men With Erectile Dysfunction. Sexual Medicine, 2019. https://doi.org/10.1016/j.esxm.2019.06.006
4. A Letter to the Editor Concerning the Meta-Analysis by Zhou et al: Meta-Analysis of the Long-Term Efficacy and Tolerance of Tadalafil Daily Compared With Tadalafil On-Demand in Treating Men With Erectile Dysfunction. Sexual Medicine, 2020. https://pubmed.ncbi.nlm.nih.gov/32035809/
5. Long-Term Safety and Efficacy of Tadalafil 5 mg Dosed Once Daily in Men with Erectile Dysfunction. The Journal of Sexual Medicine, 2008. https://doi.org/10.1111/j.1743-6109.2008.00935.x
6. Tadalafil in the treatment of erectile dysfunction. Therapeutics and Clinical Risk Management, 2008. https://pmc.ncbi.nlm.nih.gov/articles/PMC2643112/

Medical disclaimer: This article is for educational purposes only and is not medical advice. Decisions about whether any treatment is appropriate, and which approach to use, are made by a licensed clinician based on your individual health information. New Blue Health is a technology and administrative services platform, not a medical provider.