Sildenafil 150 mg and 200 mg: What the Evidence Says About High-Dose Viagra

Search for sildenafil online and you will find 150 mg and 200 mg tablets sold as "Viagra 200" or "extra strength" versions. Brand Viagra has never come in those strengths. The US label stops at 100 mg, once a day, and no FDA-approved sildenafil tablet is stronger than that. So what does a 200 mg tablet actually add, what does it cost you in side effects, and why do some men end up looking for one?

This guide sets out what is known: the dose response inside the licensed range, what the label says about doses above it, the one published study that gave men 150 mg and 200 mg after 100 mg had failed, what doses used for a different condition reveal about high exposure, and the more common reasons 100 mg seems not to work. For the basics of the drug, start with what sildenafil is and what the trials show.

The short answer

Sildenafil 150 mg and 200 mg are above the maximum dose in the Viagra label, and no FDA-approved sildenafil tablet comes in those strengths. Inside the licensed range, benefit flattens: 74% of men reported improved erections on 50 mg and 82% on 100 mg, while abnormal vision rose from 2% to 11%. The only published study of 150 mg and 200 mg in men who had failed 100 mg found that 13 of 54 (24.1%) responded, 63% had side effects at their highest dose, and 4 of the 13 responders stopped because of them. Many men who say 100 mg failed have not used it properly: in one clinic study, 24 of 41 self-reported non-responders who were retried and followed up (58.5%) succeeded on 100 mg once shown how to take it. A higher dose is not a safe shortcut, and it is dangerous with nitrates, certain other medicines, and some heart, liver and kidney conditions.

What the Viagra label allows

The US prescribing information for Viagra sets the dose range clearly:

• Usual dose 50 mg, taken about 1 hour before sex (30 minutes to 4 hours).
• Adjust to 25 mg or up to a maximum of 100 mg, depending on effect and side effects.
• No more than once a day.
• Consider 25 mg to start in men over 65, with liver impairment or severe kidney impairment, or taking erythromycin or a strong CYP3A4 inhibitor; no more than 25 mg in 48 hours with ritonavir.

The FDA's drug approvals database lists sildenafil tablets in 20 mg (for pulmonary arterial hypertension), 25 mg, 50 mg and 100 mg strengths, plus oral films up to 100 mg. There is no approved 120 mg, 150 mg or 200 mg product.

Where 150 mg and 200 mg tablets come from

The higher strengths are made by Indian manufacturers and sold mainly online. Examples include Cenforce 150 and Cenforce 200 (Centurion Laboratories), Fildena Double 200 (Fortune Healthcare) and Malegra 200. Some brands also sell 120 mg and 130 mg tablets. These products are not approved by the FDA, the UK's MHRA, Australia's TGA or Health Canada, and they are often marketed with colours and names that suggest extra power. The sildenafil inside is the same molecule as in Viagra. What changes is the amount.

Our Cenforce strengths comparison sets out every Cenforce tablet side by side, and our review of whether generic Viagra works as well as the brand covers what is and is not known about these brands' quality.

What the dose curve shows inside the licensed range

The Viagra label reports two sets of data by dose from the same trial programme. Four fixed-dose studies covering 1,797 men asked whether erections had improved. Fixed-dose studies also recorded side effects by strength.

Measure	Placebo	25 mg	50 mg	100 mg
Improved erections	24%	63%	74%	82%
Headache	7%	16%	21%	28%
Flushing	2%	10%	19%	18%
Indigestion	2%	3%	9%	17%
Abnormal vision	1%	1%	2%	11%
Nasal congestion	2%	4%	4%	9%

The pattern matters for anyone thinking about 200 mg. From 25 mg to 50 mg, benefit rose 11 points. From 50 mg to 100 mg, it rose 8 points, while indigestion rose 8 points and abnormal vision 9 points. The curve for benefit is flattening at the top of the licensed range while the curve for side effects is getting steeper. Doubling again would be expected to continue that trade, and the limited data above 100 mg, below, are consistent with it.

What the label says about doses above 100 mg

The label does not recommend any dose above 100 mg, but it reports what was seen when higher doses were given in studies:

• Side effects: "At doses above the recommended dose range, adverse reactions were similar to those detailed in Table 1 below but generally were reported more frequently."
• Healthy volunteers: single doses up to 800 mg produced the same kinds of side effects as lower doses, with higher rates and greater severity.
• High exposure: decreased blood pressure, fainting (syncope) and prolonged erection were reported in some healthy volunteers given 200 mg to 800 mg.
• Vision: single doses of 100 mg and 200 mg caused a transient, dose-related impairment of colour discrimination, seen as difficulty telling blue from green, peaking around the time of peak blood levels. Visual acuity, eye pressure and pupils were not affected at up to twice the maximum recommended dose.

In other words, the manufacturer's own data describe 200 mg as more of the same side effects, plus a few signals of low blood pressure and prolonged erection at high exposure.

What 200 mg means in the blood

The label states that sildenafil's pharmacokinetics are dose-proportional over the recommended range, so 100 mg gives roughly twice the exposure of 50 mg. It does not confirm proportionality above 100 mg. Even so, several situations already push exposure far above that of a 100 mg dose:

Situation (with a standard dose)	Change in sildenafil exposure (AUC)
Ritonavir	About 11-fold
Saquinavir	Up 210%
Erythromycin	Up 182%
Liver impairment (Child-Pugh A or B)	Up 85%
Severe kidney impairment	About double
Cimetidine	Concentrations up 56%

A man on one of these medicines or with one of these conditions taking a 200 mg tablet is stacking two increases on top of each other. That is why the label tells these groups to consider starting at 25 mg, not to go higher.

The one study of 150 mg and 200 mg after 100 mg failed

In 2002, McMahon reported 54 men with long-standing erectile dysfunction who had not achieved erections suitable for intercourse on a home trial of 100 mg. Their doses were raised step by step up to 200 mg until they responded or side effects became intolerable. The group included men with arterial disease, mixed vascular causes, venous leak, erectile dysfunction after radical prostatectomy and psychogenic causes; mean age was 59.6.

Erectile function was measured with questions 3 and 4 of the International Index of Erectile Function (IIEF): how often you could penetrate, and how often you could keep the erection after penetration. Each is scored from 0 to 5, where 5 means almost always or always and 3 means sometimes, about half the time.

Dose	IIEF Q3 (penetration)	IIEF Q4 (maintenance)	Said erections improved (global question)
Baseline	1.5	1.4	-
100 mg	2.2	1.9	37%
150 mg	2.8	2.5	46.3%
200 mg	3.0	2.9	68%

The global question is looser than erections good enough for intercourse, which is why 68% reported improvement at 200 mg while only 24.1% counted as responders. Scores rose with each step but stayed around "sometimes" even at 200 mg. The stricter measure, erections good enough for intercourse, was met by 13 of 54 men (24.1%): 4 needed 150 mg and 9 needed 200 mg. The other 41 (76%) did not respond at any dose. The study had no placebo group and was not blinded, so some of the improvement may not be due to the extra sildenafil.

Side effects at the top dose

The same study recorded what happened at each man's highest dose. Thirty-four of 54 (63%) reported side effects.

Facial flushing affected 32 men, headache 19, indigestion 14, nasal congestion 11, dizziness 5 and visual disturbance 5. The rates are much higher than in the label's 100 mg group (flushing 18%, headache 28%, indigestion 17%), although the two are not directly comparable because this was a small, uncontrolled study. The most telling figure is the dropout: 4 of the 13 men who did respond (31%) refused to continue because of side effects. The author concluded that doses up to 200 mg worked for about a quarter of non-responders but were limited by more side effects and a 31% discontinuation rate.

Why "100 mg failed" is often not a real failure

Before any talk of higher doses, it is worth asking whether 100 mg was given a fair trial. A 2004 study by Jiann and colleagues enrolled 60 men who came to a clinic saying sildenafil had not worked for them, and asked exactly how they had used it.

How they had used sildenafil (60 men)	Number
Tried it fewer than four times	36 (60%)
Never took a dose as high as 100 mg	27 (45%)
Did not know sexual stimulation is needed	18 (30%)

Forty-four men agreed to try again with instruction tailored to their mistakes and four doses of 100 mg. Of the 41 followed up, 24 (58.5%) reported successful intercourse, and the 24 responders' IIEF-5 scores improved by an average of 8.4 points. The authors' conclusion was that much of the apparent failure came from how the drug was used, not from the drug.

The common mistakes are simple: no arousal, a heavy meal beforehand (the label reports a 29% lower peak and about an hour's delay), judging it on one or two attempts, taking it too close to sex, and alcohol. Our guides to taking sildenafil safely and how long sildenafil lasts cover timing in detail.

What high doses used for pulmonary hypertension show

Sildenafil is also approved, as Revatio, for pulmonary arterial hypertension (PAH). There the usual dose is 20 mg three times a day, and the label allows up to 80 mg three times a day, a total of 240 mg a day. This is a different condition and a different population, mostly women in the main trial, so it does not tell you whether 200 mg helps erections. It does show what higher sustained exposure does.

• Exposure at 80 mg three times a day was 5 times that at 20 mg three times a day.
• In the 12-week SUPER-1 trial, walking distance improved by a similar 45 to 50 metres over placebo at 20, 40 and 80 mg, with no added benefit above 20 mg.
• Overall discontinuation was 3% at 20 mg and 40 mg, 8% at 80 mg, and 3% on placebo.
• In healthy volunteers, 80 mg three times a day lowered lying blood pressure by up to 9.0/8.4 mmHg.

Side effect (SUPER-1)	20 mg	40 mg	80 mg	Placebo
Flushing	10%	9%	16%	4%
Muscle pain	7%	6%	14%	4%
Headache	46%	42%	49%	39%
Indigestion	13%	8%	13%	7%

In the 12-week SUPER-1 trial, more sildenafil brought more side effects and more people stopping, without more benefit on walking distance. A later long-term PAH study did support doses up to 80 mg three times a day for delaying clinical worsening, so the lesson is about the short-term trade-off in a different disease, not that higher doses never add anything.

Who should not go above 100 mg

Nobody should go above 100 mg without a doctor, and some men should not take sildenafil at any dose or need lower doses:

• Nitrates and riociguat: contraindicated at any dose, including nitroglycerin, isosorbide and recreational poppers.
• Alpha blockers (tamsulosin, doxazosin, terazosin): be stable on the alpha blocker first and start sildenafil at the lowest dose.
• CYP3A4 inhibitors: ritonavir, saquinavir, erythromycin, ketoconazole, itraconazole.
• Age over 65, liver impairment or severe kidney impairment: the label suggests a 25 mg start.
• Men for whom sexual activity is inadvisable because of their heart: the label says erectile dysfunction treatments should generally not be used.
• Recent heart attack, stroke or life-threatening arrhythmia (last 6 months), resting blood pressure below 90/50 or above 170/110 mmHg, heart failure or unstable angina: not studied, and the label advises caution, as it does for aortic stenosis or other outflow obstruction and severely impaired blood pressure control.
• Previous sudden vision loss (NAION) or retinitis pigmentosa.

Vision at higher doses

The blue or green tinge that some men notice comes from sildenafil's effect on PDE6, an enzyme in the retina. The label reports it at 2% on 50 mg and 11% on 100 mg, describes it as mild to moderate and transient, and found dose-related colour discrimination changes at 100 mg and 200 mg. Five of the 54 men in the high-dose study reported visual disturbance.

A separate, rare risk applies to all PDE5 inhibitors: non-arteritic anterior ischemic optic neuropathy (NAION), which can cause permanent vision loss. The label notes observational studies suggesting about a twofold increase in risk around the time of PDE5 inhibitor use, without establishing cause. Stop the drug and get urgent care for sudden vision loss in one or both eyes. The label also warns of sudden decrease or loss of hearing, sometimes with ringing or dizziness; stop sildenafil and get prompt medical care if that happens.

Blood pressure, fainting and prolonged erections

Sildenafil lowers blood pressure a little in healthy men: the Viagra label reports a transient mean maximum fall of 8.4/5.5 mmHg in healthy volunteers. At high exposure, the Viagra label reports decreased blood pressure, fainting and prolonged erection in some volunteers given 200 mg to 800 mg. These are the effects most likely to turn dangerous when combined with alcohol, dehydration, alpha blockers or blood pressure medicines.

An erection lasting more than 4 hours needs emergency treatment. Priapism can permanently damage the tissue of the penis if it is not treated quickly.

120 mg, 130 mg and 150 mg tablets

Strengths between 100 mg and 200 mg have even less behind them. We found no published trial testing 120 mg or 130 mg sildenafil for erectile dysfunction. The McMahon study is the only one we found that reported 150 mg, where 4 of the 13 responders needed that dose and 46.3% of men said their erections had improved at 150 mg. That is one small, uncontrolled study, not a basis for choosing a dose.

What doctors try when 100 mg really fails

If 100 mg taken properly on several occasions does not work, the options a doctor may discuss include:

• Re-checking how it is taken, as the Jiann study showed.
• Checking for causes such as diabetes, low testosterone, heart disease or medicines that affect erections. Erectile dysfunction can be an early sign of cardiovascular disease.
• Daily low-dose tadalafil. A 2019 systematic review found that chronic treatment with low-dose PDE5 inhibitors can be tried when on-demand regimens fail. Switching to on-demand tadalafil 20 mg did not significantly improve scores in a small 2009 study of 40 men who had not responded to sildenafil or vardenafil.
• Non-tablet treatments. The same review notes high success rates for alprostadil injections in men who do not respond to tablets.

Our tadalafil vs sildenafil comparison and guide to high-dose tadalafil cover the tadalafil side, and the erectile dysfunction page lists the treatment options.

Where SafeRxPills stands

SafeRxPills sells sildenafil tablets above 100 mg, including Cenforce 150, Cenforce 200, Fildena Double 200 and Malegra 200. We think you should know what the evidence says before buying one. These strengths are above the maximum in the US label and are not approved by the FDA, MHRA, TGA or Health Canada. For most men, the better first step is 50 mg or 100 mg, used properly over several attempts, with a doctor's advice. If you are not sure whether a seller's tablets are genuine, our guide to checking an online Viagra seller sets out the checks, and our country-by-country guide covers prescription rules.

Related guides

For brand comparisons, see Kamagra vs Viagra and Cenforce vs Viagra. For the drug itself, our sildenafil citrate guide covers uses, doses and forms.

Sources

• VIAGRA (sildenafil citrate) tablets, US prescribing information, Pfizer, sections 2, 5, 6.1, 7, 8, 10, 12 and 14. DailyMed
• REVATIO (sildenafil) US prescribing information, revised December 2024, sections 2, 6.1, 12 and 14. DailyMed
• US Food and Drug Administration. Drugs@FDA data for sildenafil products, accessed 14 October 2026 via the openFDA drugsfda endpoint.
• McMahon CG. High dose sildenafil citrate as a salvage therapy for severe erectile dysfunction. International Journal of Impotence Research 2002. PMID 12494291.
• Jiann BP et al. Rechallenge prior sildenafil nonresponders. International Journal of Impotence Research 2004. PMID 14963473.
• Rosen RC et al. The international index of erectile function (IIEF): a multidimensional scale for assessment of erectile dysfunction. Urology 1997. PMID 9187685.
• Munk NE et al. Systematic review of oral combination therapy for erectile dysfunction when phosphodiesterase type 5 inhibitor monotherapy fails. Sexual Medicine Reviews 2019. PMID 30711478.
• Ozgur et al. Sildenafil or vardenafil nonresponders' erectile response to tadalafil. Urology Journal 2009. PMID 20027555.

This guide is for information only and is not medical advice. Sildenafil is a prescription medicine in most countries. Do not exceed the dose your doctor has prescribed.