Viagra, Cialis or Levitra? ED Pills in Hong Kong Compared

You have read about Viagra, Cialis and Levitra, and what you want is a straight answer about which one fits the evenings you actually have. You may also have looked at the virility products sold through social media and wondered whether something "natural" would be gentler.

Four medicines do this job: sildenafil, tadalafil, vardenafil and avanafil. They are all PDE5 inhibitors and all work the same way, by increasing blood flow to the penis (NHS). They differ in when you take them, how long they stay useful, how food affects them, and whether a daily low dose exists. For this article we went through the UK product information for each medicine, the US patient monographs, two large comparisons of trials, and the Hong Kong Department of Health notices about undeclared ingredients in virility products.

In short

• All four work in the same way, and all four beat placebo in the large trial comparisons.
• They differ mainly in how long before sex you take them, how long they stay useful, and how a high-fat meal affects them. Tadalafil also comes as a daily low dose.
• Never take any of them with nitrates in any form, with poppers, or with riociguat. Alpha-blockers and blood-pressure medicines need care.
• An erection lasting more than four hours, sudden loss of vision or hearing, or chest pain means urgent care.

How do Viagra, Cialis, Levitra and avanafil differ?

Sildenafil is taken about an hour before sex, and MedlinePlus adds that any time from four hours to 30 minutes before is acceptable (MedlinePlus). Tadalafil is taken at least 30 minutes before, and responsiveness has been shown up to 36 hours after the dose, with a half-life of about 17.5 hours (Cialis product information). Vardenafil goes about 25 to 60 minutes before; in the small number of men who attempted intercourse four to five hours afterwards, success rates were higher than with placebo (Levitra product information). Avanafil is the quickest at 15 to 30 minutes, and the sources read here do not say how long it stays useful (Spedra product information).

Food changes things for three of them. A high-fat meal delays the onset of sildenafil, may delay vardenafil, and may delay avanafil too (Viagra product information). Tadalafil is indifferent: with or without food.

When the four were compared across trials, all of them worked. A review of 118 trials covering 31,195 men found every PDE5 inhibitor beat placebo, with tadalafil and vardenafil ranked most effective; avanafil was less effective than both on one question, and safety was broadly alike (Yuan et al, Eur Urol 2013). A later review of 179 trials and 50,620 patients again found all four beat placebo, with sildenafil 25 mg and 50 mg and tadalafil 10 mg and 20 mg showing the best profiles; avanafil sat lower, sildenafil 100 mg was more linked to visual disturbances and vardenafil to nasal congestion (Madeira et al, World J Urol 2020). Averages across thousands of men do not settle what suits one man, which is why timing and convenience matter.

Is daily low-dose tadalafil different from the as-needed tablets?

If your weeks are unpredictable, the daily version is the one to look at. The dose is 5 mg once a day at about the same time, and it may be lowered to 2.5 mg. It is considered for men who expect to have sex at least twice a week. The 10 mg and 20 mg as-needed doses are not recommended for continuous daily use (Cialis product information).

The advantage is that nothing has to be planned. The trade-off is a tablet every day whether or not you have sex, and the daily regimen is meant to be reassessed from time to time.

PockDose lists Cialis Daily (Tadalafil) as generic tadalafil in 2.5 mg and 5 mg, once a day. If your pattern is a couple of planned nights a week, the as-needed tablets are the simpler fit.

How do you take them for the best result?

Avanafil's product information states plainly that sexual stimulation is required for a response (Spedra product information). Plan for the tablet and the mood together.

Timing is where most men lose the effect. Use the row for your medicine in the table above. A high-fat meal just before a dose of sildenafil or vardenafil slows the start, so either eat lighter or allow more time. Tadalafil does not mind food.

Alcohol deserves a thought. With avanafil, drinking can increase the chance of low blood pressure, dizziness or fainting (Spedra product information). Keep that in mind with any of the four.

One dose a day at most, whichever you choose. If the effect disappoints, step up rather than double up: sildenafil starts at 50 mg and can go down to 25 mg or up to 100 mg; vardenafil starts at 10 mg and can go to 5 mg or 20 mg; avanafil starts at 100 mg and can go to 50 mg or 200 mg; tadalafil as needed starts at 10 mg and can go to 20 mg. The upper figures are the maximum doses in the product information, once a day (Viagra product information, Levitra product information, Spedra product information, Cialis product information).

Lifestyle carries real weight here. Losing weight, stopping smoking, a healthier diet, daily exercise and less stress all help, and the NHS suggests keeping alcohol under 14 units a week (NHS). And do not drive if you feel dizzy or your sight is blurred (NHS sildenafil).

What must you never combine with them, and what needs care?

Nitrates are the absolute rule, and it covers all four medicines. Never take these tablets with nitrates in any form, including the nitrates prescribed for angina and the street nitrates known as poppers (amyl nitrite). Riociguat, used for pulmonary hypertension, is also out. The Viagra, Cialis and Spedra product information list nitrates and riociguat as contraindications, the Levitra generic's lists nitrates, and MedlinePlus adds riociguat for vardenafil (Viagra product information, Cialis product information, Levitra product information, Spedra product information, MedlinePlus vardenafil).

Alpha-blockers, the tablets used for an enlarged prostate or for blood pressure, need care rather than avoidance. With sildenafil they can cause symptomatic low blood pressure, most likely within four hours of the dose; be stable on the alpha-blocker first, and consider starting sildenafil at 25 mg (Viagra product information). Tadalafil with doxazosin is not recommended, because the effect lasts at least 12 hours and may cause fainting, though no such effect was reported with alfuzosin or tamsulosin in a small number of volunteers (Cialis product information). Vardenafil follows the same pattern: stabilise first, start at 5 mg, and tamsulosin or alfuzosin can be taken at any time (Levitra product information).

Heart conditions rule the tablets out for some men, including anyone who has been told to avoid sex because of unstable angina or severe heart failure. Sildenafil is contraindicated after a recent heart attack or stroke and at a blood pressure under 90/50 (Viagra product information). Tadalafil is contraindicated within 90 days of a heart attack, and in unstable angina, angina during intercourse, heart failure of NYHA class 2 or worse in the past six months, uncontrolled arrhythmias, low blood pressure or uncontrolled hypertension (Cialis product information). Avanafil is contraindicated within six months of a heart attack, stroke or a life-threatening arrhythmia (Spedra product information).

Vision and hearing matter too. If you have ever lost vision in one eye from non-arteritic anterior ischaemic optic neuropathy (NAION), sildenafil and vardenafil are contraindicated (Viagra product information, Levitra product information). If vision or hearing suddenly goes, stop the tablet and get urgent care. An erection lasting more than four hours is an emergency; get help (MedlinePlus sildenafil, NHS sildenafil).

Common side effects are headache, flushing, indigestion, a blocked nose and dizziness (Viagra product information). Tadalafil adds back pain and muscle ache, which rise with the dose (Cialis product information). The NHS also lists stomach ache, diarrhoea, nausea, anxiety and temporary blurred vision (NHS sildenafil). Heart attacks, strokes, irregular heartbeats and sudden death have been reported in men taking sildenafil for erection problems, most of whom had heart disease beforehand; it is not clear whether the medicine caused them (MedlinePlus sildenafil).

What did the Hong Kong Department of Health find in "natural" virility products?

The Department of Health has repeatedly found medicines inside virility products that were not on the label. Three cases show the pattern. In September 2022 it warned the public against buying or consuming HE ABSOLUTE KING, sold through a social media platform, after the Government Laboratory found tadalafil in it, undeclared (DH, 28 September 2022). In August 2023 a sample of HE-MINT bought from a retail shop in Tsuen Wan was found to contain undeclared tadalafil (DH, 7 August 2023). In April 2019, packs of Blue M held two capsules and a wet wipe; the wipe contained lignocaine and a capsule sample contained undeclared sildenafil (DH, 16 April 2019).

The Department spelled out what those undeclared doses can do: low blood pressure, headache, vomiting, dizziness and transient vision disturbances, plus the interaction with nitroglycerin used for angina, which can push blood pressure down to dangerous levels. It urged people not to buy or consume products of doubtful composition, and to stop taking one immediately if they had already bought it.

The problem with an unlabelled dose is that it is the same drug without the ingredient list, the strength or the warnings. A labelled tablet of a known strength, with its cautions on the page, is easier to use well.

When does erectile dysfunction point to the heart?

Erection problems are common, especially after 40, and often trace back to stress, tiredness or too much alcohol. They can also be a sign of something else: high blood pressure, high cholesterol, diabetes, depression and hormone problems are all causes (NHS). A review of meta-analyses found ED is often an early sign of forthcoming cardiovascular disease and is itself a risk factor for cardiovascular illness and death, which makes it a useful prompt to have blood pressure, cholesterol and blood sugar checked (Corona et al, Expert Rev Cardiovasc Ther 2020).

The NHS is direct about the check-up: if you buy sildenafil without a prescription, have a check-up within six months of starting it, because erection problems can signal diabetes or heart trouble (NHS sildenafil).

Some symptoms need care that day rather than a check-up later. The NHS lists chest pain, a fast or irregular heartbeat and fainting after sildenafil as serious side effects, and chest pain or a suspected heart attack means calling 999 in the UK, or your local emergency number in Hong Kong.

Which erectile dysfunction tablets does PockDose list?

Ordering from PockDose needs no prescription. The Viagra, Cialis and Levitra listings are generic sildenafil, tadalafil and vardenafil; Kamagra, Cenforce, Vidalista, Avana and Zydena are named listings with their own pages.

For strengths side by side, the sildenafil, tadalafil, vardenafil, avanafil and udenafil pages group them, and the whole range sits in the erectile dysfunction category, including combination tablets that add dapoxetine.

Choosing comes down to your evenings. If a long window matters, tadalafil has the longest documented one; if you want the shortest wait, avanafil is taken 15 to 30 minutes before sex; sildenafil and vardenafil sit in between at about an hour. Start at the lower strength, step up only if you need to, and read the product page before ordering, since forms and strengths differ from listing to listing.