erectile dysfunction medical treatment · 2014-01-31 · erectile dysfunction medical treatment...
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Erectile Dysfunction
Medical Treatment
Alireza Ghoreifi
Assistant of Urology
Mashhad University of Medical Sciences
March 2012
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Treatment of ED
Unknown cases of ED
Three lines
First-line therapy
Second-line therapy
Third-line therapy
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Treatment of ED
First-line therapy
Oral pharmacotherapy
Topical pharmacotherapy
Vacuum constriction devices “VCD”
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Treatment of EDSecond-line therapy
1. Intracavernous injections
2. Intraurethral alprostadil “PGE1”
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Treatment of EDThird-line therapy
Penile prothesis
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First line Treatment of EDOral pharmacotherapy
PDE5 inhibitors
The PDE5 enzyme hydrolyses cyclic
guanosine monophosphate (cGMP) in the
cavernosum tissue of the penis.
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PDE 5 inhibitorsMechanism of action
Inhibition of PDE5 reduce the
degradation of cGMP that effect on nitric oxide
Vasodilatation Smooth muscle relaxation
Penile erection
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PDE 5 inhibitors
- Sildenafil*
- Tadalafil*
- Vardenafil*
* European Medicines Agency “EMEA” Approval
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PDE 5 inhibitorsnew generation
Avanafil: currently has no trademarked
Lodenafil: (Helleva), not FDA approved
Mirodenafil: (Mvix), not FDA approved
Udenafil:( Zydena) , not FDA approved
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Sildenafil
Iaunched in 1998
First PDE5 inhibitor erection and rigidity sufficient for
vaginal penetration
Effective: 30-60 min after administration and
T max = 0.8 to 1 hour
Heavy meal prolonged absorption reduce of
efficacy
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Sildenafil
Starting dose = 50 mg and then adapt according
to the:
- Patients response
- Side-effects
Efficacy maintain for up to 12h
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Sildenafil
After 24 weeks of treatment and in a dose-response study
“Pre-market”; improved erections:
1. 25 mg = 56%
2. 50 mg = 77%
3. 100 mg = 84%
4. Placebo = 25%
In diabetics:
- Improved erection= 66.6% / 28.6%
- Successful intercourse= 63% / 33%
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Tadalafil
Licensed for the treatment of ED = Feb 2003
Effective = 30 min with peak efficacy = 2h
Efficacy is maintained for up to 36h and is not
affected by food.
Recommended starting dose = 10 mg and then
adapt
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Tadalafil
After 12 weeks of treatment and in a dose - response
study, ”Pre-market” improved erections:
1- 10 mg = 67%
2- 20 mg = 81%
3- Placebo = 35%
Diabetic = 64% / 25%
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Vardenafil
Commercially available as of March 2003
Effective = 30 min, reduce effect by a heavy fatty meal
(>57%) and Tmax = 0.9h
Recommended starting dose = 10 mg (5-10-20mg)
Improved erections in difficult-to-treat
subgroups.
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Vardenafil
5 mg = 66%
10 mg = 76%
20 mg = 80%
Placebo = 30%
Diabetic patients =72% / 13%
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PDE5 inhibitors : Not 100% effective
to everyone , every time
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Choice or preference between the
different PDE5 inhibitor
To date , no data are available
Choice of drug will depend on:
- The frequency of intercourse (occasional
use or regular therapy, 3-4 times weekly)
- Patients personal experience
Patients need to know whether a drug is short or long-
acting, possible disadvantages and how to use it
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On-demand or continuous therapy (daily)of PDE5 inhibitors?
Tadalafil 5 mg once daily is an alternative to on-demand
for couples who prefer spontaneous rather than
scheduled sexual activities or who anticipate frequent
sexual activity
Tadalafil 2.5 and 5 mg/daily is efficacious and well
tolerate
However, when patients have the choice, it seems that
they prefer on-demand rather than continuous therapy.
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Safety issues for PDE5 inhibitors
In patients receiving PDE5 inhibitors,
myocardial infarction rates does not increase.
PDE5 inhibitors may improve exercise tests,
and dose not alter cardiac contractility, and
cardiac out-put
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Absolute contraindications with the use
of PDE5 inhibitors
Agents used to treat angina:
- Organic nitrates:
nitroglycerine
isosorbide mononitrate
isosorbide dinitrate
- Other nitrate preparations
Agents used for recreation:
- Amyl nitrite or amyl nitrate
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If a PDE5 inhibitors is taken and the patients
develops:
Chest pain = nitroglycerine must be withheld for
at least 24h for use of sildenafil and vardenafil
and 48h for use of tadalafil
Angina = other agents may be given instead of
nitroglycerine until the appropriate time has
(above) passed.
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Alpha-blocker interactions
All PDE5 inhibitors show some interaction
with alpha-blockersorthostatic hypotension.
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Alpha-blocker interactions
Sildenafil (50 or 100mg ) should not
be taken within 4h following treatment
with an alpha-blocker
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Alpha-blocker interactions
Co-administration of vardenafil with
tamsulosin is not associated with
clinically significant hypotension
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Alpha-blocker interactions
In the USA, vardenafil is absolutely
contraindicated with alpha-blocker
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Alpha-blocker interactions
Tadalafil is contraindicated in patients
taking alpha-blockers, except for
tamsulosin, 0/4mg
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Dosage adjustment
Lower doses
Ketoconazole, itraconazole, erythromycine,
clarythromycin increase blood levels of
PDE5 inhibitors so that lower doses of PDE5
inhibitors are necessary.
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Dosage adjustment
higher doses
Rifampin, phenobarbital, phenytoin and
carbamazepine enhance the breakdown
of PDE5 inhibitors so that higher doses
of PDE5 inhibitors are required
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Dosage adjustment
Severe kidney or hepatic dysfunction may
require dose adjustments or warnings
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Ways of improving efficacy
1- Medication of associated risk factors.
2- Treatment of associated hypogonadisem.
3- Changing to another PDE5 inhibitor.
4- Continuous use daily of a PDE5 inhibitor.
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Non-responders to PDE5 inhibitors
Reasons
1- Incorrect drug use= the main reason is
inadequate counseling from his physician.
2- Inefficacy of the drug
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Management of non-responders to PDE5 inhibitors
Check by physician
Using a licensed medication (black market)
The main ways in which a drug may be incorrectly
used are:
- Failure to use adequate sexual stimulation
- Failure to use an adequate dose
- Failure to wait an adequate amount of
time between taking the medication
and attempting sexual intercourse
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PDE5 inhibitorsTime between taking and intercourse
All three drugs have an onset of action in
some patients within 30 min of oral ingestion,
most patients require a longer time with at
least:
60 min for sildenafil and vardenafil
2h for tadalafil
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PDE5 inhibitors
food and delay of absorption
Sildenafil = Heavy meal
Vardenafil = Fatty meal
Tadalafil = Is less affected
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Side effects of PDE5 inhibitors
Flushing and headache (mild to moderate in
severity)
Myalgia, back pain, leg pain, vision disturbances
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ED and dyslipedemia
In hypercholesteromic men with erectile
dysfunction not initially responsive to
sildenafil improves the response to
sildenafil
LDL > 120 mg/100cc
40 mg atorvastatin
100 mg On-demand sildenafil for 12 weeks.
27 Nov 2009
Atorvastatine
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Treatment of EDFirst-line therapy
Apomorphine sublingualis a centrally acting dopamine agonist
Enhancing the natural central erectile signals that occur during sexual stimulation
improve erectile erection
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Apomorphine
Has been approved in several countries
but
not in the USA
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Apomorphine
Dose = 2 or 3 mg sublingually
Efficacy rate = 28.5% to 55%.
Due to rapid absorption, 71% of erections
are achieved within 20 min
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Apomorphine
Most common adverse effects
Nausea 7%
Headache 6.8%
Dizziness 4.4%
Are generally mild in nature and self-limited.
Severe events such as syncope, are
extremely rare = < 0.2%
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Apomorphine
Apomorphine is not contraindicated in
patients that taking nitrates or
antihypertensive drugs (of all classes) and
is a first-line treatment in patients, who use
nitrates.
Does not effect on vital signs.
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Apomorphine
It is use is limited to patients with mild to
moderate ED or psychogenic causes of
sexual dysfunction due to reduce efficacy
rates.
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Treatment of EDOther oral treatment
Yohimbine and Trazodone
Randomized trials have shown that
yohimbine and trazodone have a similar
efficacy to placebo in patients with organic
causes of ED.
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Other oral agents
Red korea ginseng
Is a formulation with an unknown mechanism of
action (though it may possibly act as a nitric oxide
donor)
Efficacy data on red korea ginseng suggested it
might have a role in treatment of ED
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Other oral agents
Phentolamine
Oral formulation of phentolamine (non selective
alpha-adrenergic antagonist) had efficacy rates
(erections sufficient for intercourse) of about
50%, but possible carcinogenesis in animal
models stopped further development.
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Other oral agents
l-argenine is a nitric oxide donor
Nalmefene / naltrexone is an opioid-receptor
antagonist
Limaprost is an alprostadil derivative for oral use
There are no efficacy data on these drugs
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Treatment of EDFirst-line therapy
Topical pharmacotherapy
No topical therapy has been approved and
currently these agents have no role in
treatment of ED.
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Treatment of EDFirst-line therapy
Vacuum therapy
More acceptable to older patients with infrequent
sexual intercourses
Efficacy is as high as 90%
Satisfactory rate range = 27% and 94%
Long-term use decreases to 50% - 64% after
2 years
Most men who discontinue use of VCDs do so
within 3 months
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Vacuum therapyThe commonest adverse events
Occur in less than 30% of patients:
Penis pain, petechiae , bruising,
numbness, inability to ejaculate, and
delayed ejaculation
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Treatment of EDSecond-line therapy
1. Intracavernous injections
- Monotherapy “Alprostadil PGE1”
- Combination therapy:
* Papaverine + Phentolamine
* Papaverine + Phentolamine + PGE1
2. Intraurethral alprostadil “PGE1”
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Treatment of EDSecond-line monotherapy therapy
Alprostadil “PGE1”
Is the first and only approved for
intracavernous ED treatment in general
ED papulation and patients subgroups
“diabetes, cardiovascular disease”.
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Alprostadil
Efficacy rate > 70 %
Satisfaction rate = 87% - 93.5% in patients and 86%
-90.3% in partners
Doses : 5 - 4µg and erection appears after 5 -15 min
Drop-out rate : 41% - 68% particularly within the first
2 - 3 months
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Alprostadil
Complications:
* Pain 50% after 11% of injections
* Prolonged erection 5%
* Priapism 1%
* Fibrosis 2%
* Hypotension is uncommon
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AlprostadilContraindications
History of hypersensitivity to alprostadil
Men at risk of priapism
Men with bleeding disorders
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Intracavernous injectionsCombination therapy
1) Papaverine 7.5 - 45mg + Phentolamine 0.25 -1.5mg
2) Papaverine 8-16mg + Phentolamine 0.2-0.4mg+
Alprostadil 10-20µg
Penile pain due to decrease of dose of Alprostadil
and fibrosis for Phentolamine and mild
hepatotoxicity with Papaverine
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Intracavernous injections
Combination therapy
Efficacy rate = 92%
If not respond to combination therapy
sildenafil + triple combination regimen
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Treatment of EDSecond-line therapyIntraurethral alprostadil
125-1000µg in a medicated pellet
Erection sufficient for intercourse = 30% - 65.9%
Adverse events:
* Local pain 29% - 41%
* Dizziness 1.9% - 14%
* Penile fibrosis and priapism < 1%
* Urethral bleeding 5%
* Urinary tract infections 0.2%
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Third-line therapy
Penile prothesis
Do not respond to pharmacotherapy
Who prefer a permanent solution to their problem
Malleable (semi-rigid) and inflatable:
- Two piece
- Three piece
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Penile prothesis
Complications
Mechanical failures < 5% at 5 years fallow up
Infection = 2-3% but with antibiotic -impregnated
prothesis or hydrophilic – coated prothesis = 1%
In spinal cord injuries : infection and erosions = 9%
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when infection occurred:
1) Removed the prothesis, antibiotic
administration and re-implantation after
6-12 months.
2) Removed and re-implantation at the same
time, after copious irrigation of the
corpora with multi-drug solutions, had
an 82% success rate.
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