How do users rate Tadalafil overall?
Tadalafil is the active ingredient in Cialis and its generic versions, an oral tablet used to treat erectile dysfunction. It's the longer-acting of the common ED medications, which is why so much of the feedback below comes back to one thing: time.
The overall picture is positive.
On Drugs.com, tadalafil averages 8.5 out of 10 across 655 reviews for erectile dysfunction, with 82% of reviewers reporting a positive experience and 10% a negative one. WebMD is much the same: roughly 4.1 out of 5 across 561 reviews, about 82% positive.
The same themes recur: erections that are reliable rather than dramatic, a long window that takes the pressure off timing, and, often, relief.
For men who've avoided the subject for years, a working treatment makes a big difference well beyond the bedroom.
How does Tadalafil work in erectile dysfunction?
It's a PDE5 inhibitor, blocking the enzyme phosphodiesterase type 5 so the nitric oxide and cGMP pathway can relax the smooth muscle in the blood vessels of the penis, increasing blood flow during arousal. [1, 2] Tadalafil is also licensed for benign prostate enlargement and, at higher doses, pulmonary hypertension. [1]
The part users most often misunderstand is that it doesn't create an erection on its own: sexual stimulation is still needed for sexual intercourse. [2] What sets it apart from sildenafil is how long it stays active: a single dose can work for up to 36 hours - hence, “the weekend pill”. [1]
Positive Tadalafil reviews: what worked well
Most positive feedback splits along dose lines, so it's worth taking each in turn.
Tadalafil 10mg reviews
Ten milligrams is the usual on-demand starting dose, and for many men it's enough. [2]
"10mg of Cialis changed all that! My penis stays half erect for a day and a half after each dose, and even the lightest touch brings it fully erect."
"I take Cialis 10mg, and the effect lasts for at least 36 hours. Rock-hard erections that last as long as required, I feel like a 'real man' once again."
The long duration is what reviewers value most here, and it matches how the drug behaves.
Tadalafil 20mg reviews
Twenty milligrams is the step up when 10mg doesn't give a good enough result. [2]
"I used the 20mg as needed tablet and after getting aroused, It gave me an extremely hard erection which stayed hard... I feel like I'm 20 years old again and I'm 60."
One account of moving up also flags something worth knowing:
"The dosage of 10mg only works reasonably well for the first few times... Once I asked for 20mg... it works much better... after 2 hours after taking the pill (not 30 min as advertised)."
That last point is common: onset is often closer to an hour or two than the headline half-hour, worth knowing before judging a dose a failure.
Tadalafil daily 5mg reviews
Instead of dosing before sex, some men take a low dose (2.5mg or 5mg) every day. This suits anyone using treatment at least twice a week, keeps a steady level in the body and removes the planning. [2] (Tadalafil daily 5mg is prescribed on this basis.)
"Since taking it, we're back to where we were many years ago... My dosage is 5mg daily. My only regret is that I waited too long to discuss this with my Dr."
There's clinical support behind the enthusiasm. In a randomised comparison, intercourse was completed successfully in 84% of attempts on daily tadalafil against 69% on on-demand dosing. [3]
Note: several reviewers describe cutting or quartering tablets to make their own daily dose. Tadalafil should be swallowed whole, and the strength and regimen are your prescriber's call, not something to improvise. [1]
Negative Tadalafil reviews: when it didn't work as expected
It would be dishonest to present tadalafil as a certainty. A minority of men report a poor or unpredictable response, and those accounts deserve as much space as the good ones.
"Started with lower doses, but didn't work, so went up to 20mg tablets. Only partially effective. Sometimes works ok, then other times, nothing... not dependable. Very frustrating."
"Requires substantial stimulation. Gave me nausea and heartburn along with elevated pulse rate."
Most underperformance has little to do with the active ingredient: taking it too close to sex, expecting an erection without arousal, an underlying condition affecting blood flow or nerves, or too low a dose. Guidance suggests several properly timed attempts before concluding a dose has failed, and response is lower in men with more complex disease. [3, 5]
Tadalafil side effects: what users actually report
Like all medicines, tadalafil can cause side effects, though not everyone gets them. The ones users describe track the recognised list: indigestion, muscle aches and limb pain, back pain, a blocked or stuffy nose, facial flushing and headache. [1]
"...worked fantastic the first time I used it (10 mg)... However, after the third time... I developed the most severe back and leg ache I've ever experienced in my life... After 48 hours, it finally subsided."
"Headache and lower back ache when taking for the first 3 months but now 12 months of use and no side effects."
Back pain and muscle ache are among the more distinctive tadalafil effects, usually coming on a day or so after a dose and easing within a couple of days. [1, 3] For most men they're mild and settle with use. The serious effects are rare but need naming: an erection lasting more than four hours (priapism), sudden loss of vision or hearing, chest pain or an allergic reaction all mean stopping the tablet and seeking urgent medical help.
How quickly and how long does Tadalafil work?
For on-demand use, take a tablet at least 30 minutes before sex, and the effect can last up to 36 hours. [1, 2] Daily dosing works differently, building a steady level over several days rather than switching on for one occasion. [4]
"I still felt the effects after 36 hours. Couldn't believe it. Basically gets hard when you want, not all day."
The long window is the main selling point. Reviewers add that onset is often slower than advertised, and that a long duration isn't a constant erection: you still need arousal within that window to get the desired effect.
Tadalafil reviews from users with specific health conditions
Response to tadalafil varies with the reason for the erectile dysfunction, and reviews from men managing other conditions show that clearly.
Users with diabetes
Diabetes affects the blood vessels and nerves that erections depend on, so the response can be weaker and less predictable.
"Type II insulin-dependent diabetic and stroke patient... a good erection is almost a myth. 5mg daily works more for night urination... 10mg... give a 'next day' erection, but not really firm enough for ejaculation very often."
This matches the trial data. In a study of men with diabetes and erectile dysfunction, 56% reported improved erections on 10mg and 64% on 20mg. [5] Tadalafil helps most diabetic men, but the response sits below that in the general population, and those with several overlapping conditions may find it only partly effective.
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Users with high blood pressure
"I'm 6 foot, 190 lbs, in relatively good shape. I smoke, have high blood pressure, but don't drink alcohol... I went to the doctor, testosterone levels normal, and he gave me a script for daily Cialis. After 3 days... Rock hard. Almost zero stimulation required."
Note: this reviewer reports a great result, but a smoker with high blood pressure is exactly the profile a prescriber needs to assess first.
Blood pressure is the most important safety check with tadalafil. Men with well-controlled high blood pressure can often use it after assessment, but it isn't suitable if blood pressure is uncontrolled or too low, and it must never be combined with nitrates. [1, 2]
If you take an alpha-blocker for blood pressure or prostate symptoms, you should be settled on that treatment first, to reduce the risk of dizziness from a drop in blood pressure. [2] Either way, this is a conversation to have with a prescriber, not a decision to make alone.
Generic Tadalafil vs Cialis: what do user reviews say about the difference?
Cialis is the original brand; generic tadalafil, the non-branded version, contains the same active ingredient at the same dose and is a cheaper alternative, and UK-licensed generics must demonstrate bioequivalence before sale. In practice, that means no clinical difference. Even so, a persistent minority of reviewers feel one works better for them.
"The comments about the brand of 'generic' that works better is accurate in my case. My doctor said the binder or other 'passive ingredients' may be the problem. The 'name brand' Cialis (FAR more expensive) isn't more effective."
Where a difference is felt, it usually comes down to inactive ingredients or expectation, not the tadalafil itself. The sensible course is to buy Cialis tablets or generic tadalafil from a regulated pharmacy and judge by results, not branding. The Cialis side effects apply equally to generic tadalafil.
Tadalafil vs Sildenafil: which do users prefer?
This is one of the most discussed choices in erectile dysfunction, and preference comes down to lifestyle more than strength. (Sildenafil vs Tadalafil sets out the full comparison.)
"I've used Viagra... Night and day. Cialis is my wonder drug... It lasts for days, it seems. And I can ejaculate easier than I could with Viagra. And I'm not as rock hard. More natural."
For balance, plenty of men go the other way:
"Viagra/Sildenafil works 100% better. My experience with the 20mg dose was not good as far as ED was concerned." webmd.com
The real difference is duration. Sildenafil works for roughly four to five hours and is usually taken on an empty stomach; tadalafil lasts up to 36 hours and is less affected by food. [1] Tadalafil also offers the daily low-dose option that sildenafil doesn't. Men who dislike clock-watching tend to prefer tadalafil; others prefer sildenafil. Neither is universally superior.
Tips for getting the best results
A few practical points recur across the reviews and guidance.
- Take an on-demand dose at least 30 minutes before sex, allowing more time if needed, since onset is often closer to an hour.
- Food matters less than with sildenafil, but avoid grapefruit juice, which can raise tadalafil levels. [1, 2]
- Keep alcohol moderate, as too much makes an erection harder and adds to dizziness. [1]
- On a daily dose, give it several days to reach full effect and the desired results, and give any dose several proper attempts before writing it off.
- Don't adjust or split your dose yourself, and tell your prescriber about every other medicine you take, including antibiotics and herbal remedies, with nitrates most important of all.
Where to buy Tadalafil online safely in the UK
Buying tadalafil tablets online is now the norm, and through a regulated service it's safe, convenient and delivered in discreet packaging. The risk is unregulated sellers. Between 2021 and 2025, the MHRA seized around 19.5 million doses of illegal erectile dysfunction medicines, many containing no active ingredient, the wrong dose, hidden drugs or toxic substances, and especially dangerous for men with heart disease or high blood pressure. [6]
Use only a UK-registered pharmacy that requires a consultation and prescription; look for the registered pharmacy logo and check registration with the General Pharmaceutical Council. You can buy Tadalafil through a regulated service that reviews your suitability before supplying it. Avoid any site selling prescription tablets with no questions asked or at suspiciously low prices.
FAQs
Is Tadalafil really effective?
For most men, yes. Review platforms put satisfaction above 80%, and clinical trials show clear improvement over placebo. [3, 5] It isn't universal, and response is lower where the cause is strongly physical, but it works well for most.
Does Tadalafil work the first time?
It can, but not always. Timing, arousal, food, alcohol and dose all affect the result, and a slow first attempt is common. A daily dose takes several days to reach full effect. Try it properly a few times first.
How long does Tadalafil last?
An on-demand dose can work for up to 36 hours, the weekend pill. [1] That's a long window, not a 36-hour erection: you still need arousal.
Can I take Tadalafil every day?
Yes. A 2.5mg or 5mg daily dose is designed for regular use and suits men who prefer not to plan around a tablet. [2] It should be prescribed and reviewed by a clinician, and never double up on top of your daily dose.
Is Tadalafil the same as Cialis?
Cialis is the brand name; tadalafil is the active ingredient. Generic tadalafil is bioequivalent and works the same way, usually far cheaper.
Is Tadalafil as strong as Viagra?
They're not really comparable on strength. Tadalafil lasts far longer and is less affected by food; sildenafil (Viagra) acts over a shorter window. Which suits you better depends on how you want to use it.
What if Tadalafil does not work?
Review the timing, dose and underlying causes with your GP, pharmacist or clinical team before giving up, and ask about a broader ED treatment review. Options include adjusting the dose, trying other ED medications such as sildenafil, avanafil or vardenafil, or other treatments if tablets aren't suitable. Don't self-escalate or combine treatments.
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[1] NHS. Tadalafil. https://www.nhs.uk/medicines/tadalafil/
[2] Cialis 20mg film-coated tablets: Summary of Product Characteristics. electronic medicines compendium (emc). https://www.medicines.org.uk/emc/product/7430/smpc
[3] McMahon C. Comparison of efficacy, safety, and tolerability of on-demand tadalafil and daily dosed tadalafil for the treatment of erectile dysfunction. J Sex Med. 2005;2(3):415-425. doi:10.1111/j.1743-6109.2005.20360.x
[4] Washington SL 3rd, Shindel AW. A once-daily dose of tadalafil for erectile dysfunction: compliance and efficacy. Drug Des Devel Ther. 2010;4:159-171. doi:10.2147/DDDT.S9067
[5] Sáenz de Tejada I, Anglin G, Knight JR, Emmick JT. Effects of tadalafil on erectile dysfunction in men with diabetes. Diabetes Care. 2002;25(12):2159-2164. doi:10.2337/diacare.25.12.2159
[6] MHRA. 20 million illegal erectile dysfunction pills seized as MHRA warns against risky online buys. GOV.UK; 2026.
