What is Sildenazinn?
Sildenazinn is used to treat men who have erectile dysfunction (also called sexual impotence). Sildenazinn belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors. These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly. The penis is one of the areas where this enzyme works.
Erectile dysfunction is a condition where the penis does not harden and expand when a man is sexually excited, or when he cannot keep an erection. When a man is sexually stimulated, his body's normal response is to increase blood flow to his penis to produce an erection. By controlling the enzyme, Sildenazinn helps to maintain an erection after the penis is stroked. Without physical action to the penis, such as that occurring during sexual intercourse, Sildenazinn will not work to cause an erection.
Sildenazinn is also used in both men and women to treat the symptoms of pulmonary arterial hypertension. This is a type of high blood pressure that occurs between the heart and the lungs. When hypertension occurs in the lungs, the heart must work harder to pump enough blood through the lungs. Sildenazinn works on the PDE5 enzyme in the lungs to relax the blood vessels. This will increase the supply of blood to the lungs and reduce the workload of the heart.
Sildenazinn is available only with your doctor's prescription.
Sildenazinn indications
Sildenazinn is indicated for the treatment of pulmonary arterial hypertension (WHO Group I) in adults to improve exercise ability and delay clinical worsening. The delay in clinical worsening was demonstrated when Sildenazinn was added to background epoprostenol therapy.
Studies establishing effectiveness were short-term (12 to 16 weeks), and included predominately patients with New York Heart Association (NYHA) Functional Class II–III symptoms and idiopathic etiology (71%) or associated with connective tissue disease (CTD) (25%).
Limitation of Use: Adding Sildenazinn to bosentan therapy does not result in any beneficial effect on exercise capacity.
How should I use Sildenazinn?
Use Sildenazinn suspension as directed by your doctor. Check the label on the medicine for exact dosing instructions.
- An extra patient leaflet with detailed instructions for use is available with Sildenazinn suspension. Talk to your pharmacist if you have questions about this information.
- Take Sildenazinn suspension by mouth with or without food. Take your doses 4 to 6 hours apart unless your doctor tells you otherwise.
- Shake well for at least 10 seconds before each use.
- Use the oral dosing syringe that comes with Sildenazinn suspension to measure your dose. Ask your pharmacist for help if you are unsure of how to measure your dose.
- Do not mix Sildenazinn suspension with other medicine or flavoring.
- Wash and dry the dosing syringe after each use.
- Take Sildenazinn suspension on a regular schedule to get the most benefit from it. Take it at the same times each day.
- Continue to take Sildenazinn suspension even if you feel well. Do not miss any doses.
- Do not suddenly stop taking Sildenazinn suspension or change your dose without talking to your doctor.
- If you miss a dose of Sildenazinn suspension, take it as soon as possible. If it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not take 2 doses at once.
Ask your health care provider any questions you may have about how to use Sildenazinn suspension.
Uses of Sildenazinn in details
Use: Labeled Indications
Erectile dysfunction: Sildenazinn: Treatment of erectile dysfunction.
Pulmonary arterial hypertension: Sildenazinn: Treatment of pulmonary arterial hypertension (WHO group I; efficacy established predominately in patients with WHO/NYHA functional class II and III) in adults to improve exercise ability and delay clinical worsening.
Off Label Uses
High-altitude pulmonary edema
Based on the 2019 Wilderness Medical Society consensus guidelines for the prevention and treatment of acute altitude illness, Sildenazinn is a recommended option for the prevention and treatment of high-altitude pulmonary edema (as an adjunct to descent, oxygen, or portable hyperbaric therapy). Supplemental oxygen and descent are the mainstays of treatment. For prevention, Sildenazinn should only be considered for patients with a history of high-altitude pulmonary edema, especially multiple episodes.
Raynaud phenomenon
Data from a meta-analysis and small controlled trials support the use of Sildenazinn for Raynaud phenomenon related to systemic sclerosis, demonstrating a decrease in the frequency and severity of attacks.
Sildenazinn description
Each film-coated tablet contains Sildenafil citrate equivalent to 50 mg Sildenazinn.
Each film-coated tablet contains Sildenafil citrate equivalent to 100 mg Sildenazinn.
Each orodispersible tablet contains Sildenafil citrate equivalent to 50 mg Sildenazinn.
Excipients/Inactive Ingredients: Film-Coated Tablets: In addition to the active ingredient, Sildenazinn citrate, each tablet contains the following inactive ingredients: Microcrystalline cellulose, calcium hydrogen phosphate (anhydrous), croscarmellose sodium, magnesium stearate, hydroxypropyl methylcellulose (hypromellose), titanium dioxide (E171), lactose, triacetin, and FD & C Blue #2 aluminum lake [indigo carmine aluminum lake (E132)].
Orodispersible Tablets: In addition to the active ingredient, Sildenazinn citrate, each orodispersible tablet contains the following inactive ingredients: Microcrystalline cellulose, silica hydrophobic colloidal, croscarmellose sodium, magnesium stearate, indigo carmine aluminium lake (E132), sucralose, mannitol, crospovidone, polyvinyl acetate, povidone, flavouring (contains: Maltodextrin and dextrin), natural flavouring (contains: Maltodextrin, E422 glycerol and E1520 propylene glycol), lemon flavouring (contains: Maltodextrin and E307 alpha tocopherol).
Sildenazinn dosage
Sildenazinn Dosage
Generic name: Sildenazinn CITRATE 20mg
Dosage form: tablet, film coated; injection; oral powder
The information at Drugs.com is not a substitute for medical advice. Always consult your doctor or pharmacist.
Sildenazinn Tablets and
Oral Suspension
The recommended dose of Sildenazinn is 5 mg or 20 mg three times a day. Administer Sildenazinn doses 4–6 hours apart.
In the clinical trial no greater efficacy was achieved with the use of higher doses. Treatment with doses higher than 20 mg three times a day is not recommended.
Sildenazinn Injection
Sildenazinn injection is for the continued treatment of patients with PAH who are currently prescribed oral Sildenazinn and who are temporarily unable to take oral medication.
The recommended dose is 2.5 mg or 10 mg administered as an intravenous bolus injection three times a day. The dose of Sildenazinn injection does not need to be adjusted for body weight.
A 10 mg dose of Sildenazinn injection is predicted to provide pharmacological effect of Sildenazinn and its N-desmethyl metabolite equivalent to that of a 20 mg oral dose.
Reconstitution of the Powder for
Oral Suspension
- Tap the bottle to release the powder.
- Remove the cap.
- Accurately measure out 60 mL of water and pour the water into the bottle. (Figure 1)
Figure 1
- Replace the cap and shake the bottle vigorously for a minimum of 30 seconds. (Figure 2)
Figure 2
- Remove the cap.
- Accurately measure out another 30 mL of water and add this to the bottle. You should always add a total of 90 mL of water irrespective of the dose prescribed. (Figure 3)
Figure 3
- Replace the cap and shake the bottle vigorously for a minimum of 30 seconds. (Figure 4)
Figure 4
- Remove the cap.
- Press the bottle adaptor into the neck of the bottle (as shown on Figure 5, below). The adaptor is provided so that you can fill the oral syringe with medicine from the bottle. Replace the cap on the bottle.
Figure 5
- Write the expiration date of the constituted oral suspension on the bottle label (the expiration date of the constituted oral suspension is 60 days from the date of constitution).
Incompatibilities
Do not mix with any other medication or additional flavoring agent.
More about Sildenazinn (Sildenazinn)
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Consumer resources
- Sildenazinn
- Sildenazinn Injection
- Sildenazinn suspension
- Sildenazinn (Advanced Reading)
- Sildenazinn
Intravenous (Advanced Reading)
- Other brands: Sildenazinn
Professional resources
- Sildenazinn (FDA)
- Sildenazinn Citrate (AHFS Monograph)
Related treatment guides
- Pulmonary Hypertension
Sildenazinn interactions
See also:
What other drugs will affect Sildenazinn?
Effects of Other Drugs on Sildenazinn Sildenazinn Citrate
In Vitro Studies: Sildenazinn Sildenazinn metabolism is principally mediated by the cytochrome P450 (CYP) isoforms 3A4 (major route) and 2C9 (minor route). Therefore, inhibitors of these isoenzymes may reduce Sildenazinn clearance.
In Vivo Studies: Cimetidine (800 mg), a nonspecific CYP inhibitor, caused a 56% increase in plasma Sildenazinn concentrations when coadministered with Sildenazinn citrate (50 mg) to healthy volunteers.
When a single 100 mg dose of Sildenazinn citrate was administered with erythromycin, a specific CYP3A4 inhibitor, at steady state (500 mg bid for 5 days), there was a 182% increase in Sildenazinn systemic exposure (AUC). In addition, coadministration of the HIV protease inhibitor saquinavir, also a CYP3A4 inhibitor, at steady state (1200 mg tid) with Sildenazinn citrate (100 mg single dose) resulted in a 140% increase in Sildenazinn Cmax and a 210% increase in Sildenazinn AUC. Sildenazinn Sildenazinn citrate had no effect on saquinavir pharmacokinetics. Stronger CYP3A4 inhibitors such as ketoconazole or itraconazole would be expected to have still greater effects, and population data from patients in clinical trials did indicate a reduction in Sildenazinn clearance when it was coadministered with CYP3A4 inhibitors (such as ketoconazole, erythromycin, or cimetidine).
Coadministration with the HIV protease inhibitor ritonavir, which is a highly potent P450 inhibitor, at steady state (400 mg bid) with Sildenazinn citrate (100 mg single dose) resulted in a 300% (4-fold) increase in Sildenazinn Cmax and a 1000% (11-fold) increase in Sildenazinn plasma AUC. At 24 hours the plasma levels of Sildenazinn were still approximately 200 ng/mL, compared to approximately 5 ng/mL when Sildenazinn was dosed alone. This is consistent with ritonavirs marked effects on a broad range of P450 substrates. Sildenazinn Sildenazinn citrate had no effect on ritonavir pharmacokinetics.
It can be expected that concomitant administration of CYP3A4 inducers, such as rifampin, will decrease plasma levels of Sildenazinn.
Single doses of antacid (magnesium hydroxide/aluminum hydroxide) did not affect the bioavailability of Sildenazinn citrate.
Pharmacokinetic data from patients in clinical trials showed no effect on Sildenazinn pharmacokinetics of CYP2C9 inhibitors (such as tolbutamide, warfarin), CYP2D6 inhibitors (such as selective serotonin reuptake inhibitors, tricyclic antidepressants), thiazide and related diuretics, ACE inhibitors, and calcium channel blockers. The AUC of the active metabolite, N-desmethyl Sildenazinn, was increased 62% by loop and potassium-sparing diuretics and 102% by nonspecific beta-blockers. These effects on the metabolite are not expected to be of clinical consequence.
Effects of Sildenazinn Sildenazinn Citrate on Other Drugs
In Vitro Studies: Sildenazinn Sildenazinn is a weak inhibitor of the cytochrome P450 isoforms 1A2, 2C9, 2C19, 2D6, 2E1 and 3A4 (IC50 >150 mM). Given Sildenazinn peak plasma concentrations of approximately 1 mcM after recommended doses, it is unlikely that Sildenazinn citrate will alter the clearance of substrates of these isoenzymes.
In Vivo Studies: When Sildenazinn citrate 100 mg oral was coadministered with amlodipine, 5 mg or 10 mg oral, to hypertensive patients, the mean additional reduction on supine blood pressure was 8 mmHg systolic and 7 mmHg diastolic.
No significant interactions were shown with tolbutamide (250 mg) or warfarin (40 mg), both of which are metabolized by CYP2C9.
Sildenazinn Sildenazinn citrate (50 mg) did not potentiate the increase in bleeding time caused by aspirin (150 mg).
Sildenazinn Sildenazinn citrate (50 mg) did not potentiate the hypotensive effect of alcohol in healthy volunteers with mean maximum blood alcohol levels of 0.08%.
Sildenazinn Sildenazinn (100 mg) did not affect the steady state pharmacokinetics of the HIV protease inhibitors, saquinavir and ritonavir, both of which are CYP3A4 substrates.
Sildenazinn side effects
See also:
What are the possible side effects of Sildenazinn?
The following serious adverse events are discussed elsewhere in the labeling:
- Mortality with pediatric use
- Hypotension
- Vision loss
- Hearing loss
- Priapism
- Vaso-occlusive crisis
Clinical Trials Experience
Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.
Safety data of Sildenazinn in adults were obtained from the 12-week, placebo-controlled clinical study (Study 1) and an open-label extension study in 277 Sildenazinn-treated patients with PAH, WHO Group I.
The overall frequency of discontinuation in Sildenazinn-treated patients on 20 mg three times a day was 3% and was the same for the placebo group.
In Study 1, the adverse reactions that were reported by at least 3% of Sildenazinn-treated patients (20 mg three times a day) and were more frequent in Sildenazinn-treated patients than in placebo-treated patients are shown in Table 1. Adverse reactions were generally transient and mild to moderate in nature.
Table 1: Most Common Adverse Reactions in Patients with PAH in Study 1 (More Frequent in Sildenazinn-Treated Patients than Placebo-Treated Patients and Incidence ≥ 3% in Sildenazinn-Treated Patients)
| Placebo, % (n = 70) | Sildenazinn 20 mg three times a day, % (n = 69) | Placebo-Subtracted, % | |
| Epistaxis | 1 | 9 | 8 |
| Headache | 39 | 46 | 7 |
| Dyspepsia | 7 | 13 | 6 |
| Flushing | 4 | 10 | 6 |
| Insomnia | 1 | 7 | 6 |
| Erythema | 1 | 6 | 5 |
| Dyspnea exacerbated | 3 | 7 | 4 |
| Rhinitis | 0 | 4 | 4 |
| Diarrhea | 6 | 9 | 3 |
| Myalgia | 4 | 7 | 3 |
| Pyrexia | 3 | 6 | 3 |
| Gastritis | 0 | 3 | 3 |
| Sinusitis | 0 | 3 | 3 |
| Paresthesia | 0 | 3 | 3 |
At doses higher than the recommended 20 mg three times a day, there was a greater incidence of some adverse reactions including flushing, diarrhea, myalgia and visual disturbances. Visual disturbances were identified as mild and transient, and were predominately color-tinge to vision, but also increased sensitivity to light or blurred vision.
The incidence of retinal hemorrhage with Sildenazinn 20 mg three times a day was 1.4% versus 0% placebo and for all Sildenazinn doses studied was 1.9% versus 0% placebo. The incidence of eye hemorrhage at both 20 mg three times a day and at all doses studied was 1.4% for Sildenazinn versus 1.4% for placebo. The patients experiencing these reactions had risk factors for hemorrhage including concurrent anticoagulant therapy.
In a placebo-controlled fixed dose titration study (Study 2) of Sildenazinn (starting with recommended dose of 20 mg and increased to 40 mg and then 80 mg all three times a day) as an adjunct to intravenous epoprostenol in patients with PAH, the adverse reactions that were more frequent in the Sildenazinn + epoprostenol group than in the epoprostenol group (greater than 6% difference) are shown in Table 2.
Table 2: Adverse Reactions (%) in patients with PAH in Study 2 (incidence in Sildenazinn + Epoprostenol group at least 6% greater than Epoprostenol group)
| Sildenazinn + Epoprostenol (n = 134) | Epoprostenol (n = 131) | (Sildenazinn + Epoprostenol) minus Epoprostenol | |
| Headache | 57 | 34 | 23 |
| Edema^ | 25 | 13 | 14 |
| Dyspepsia | 16 | 2 | 14 |
| Pain in extremity | 17 | 6 | 11 |
| Diarrhea | 25 | 18 | 7 |
| Nausea | 25 | 18 | 7 |
| Nasal congestion | 9 | 2 | 7 |
| ^includes peripheral edema |
Sildenazinn Injection
Sildenazinn injection was studied in a 66-patient, placebo-controlled study in patients with PAH at doses targeting plasma concentrations between 10 and 500 ng/mL (up to 8 times the exposure of the recommended dose). Adverse events with Sildenazinn injection were similar to those seen with oral tablets.
Postmarketing Experience
The following adverse reactions have been identified during post approval use of Sildenazinn (marketed for both PAH and erectile dysfunction). Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.
Cardiovascular Events
In postmarketing experience with Sildenazinn at doses indicated for erectile dysfunction, serious cardiovascular, cerebrovascular, and vascular events, including myocardial infarction, sudden cardiac death, ventricular arrhythmia, cerebrovascular hemorrhage, transient ischemic attack, hypertension, pulmonary hemorrhage, and subarachnoid and intracerebral hemorrhages have been reported in temporal association with the use of the drug. Most, but not all, of these patients had preexisting cardiovascular risk factors. Many of these events were reported to occur during or shortly after sexual activity, and a few were reported to occur shortly after the use of Sildenazinn without sexual activity. Others were reported to have occurred hours to days after use concurrent with sexual activity. It is not possible to determine whether these events are related directly to Sildenazinn, to sexual activity, to the patient's underlying cardiovascular disease, or to a combination of these or other factors.
Nervous system
Seizure, seizure recurrence
Sildenazinn contraindications
See also:
What is the most important information I should know about Sildenazinn?
Do not take Sildenazinn if you are also using a nitrate drug for chest pain or heart problems. This includes nitroglycerin (Nitrostat, Nitrolingual, Nitro-Dur, Nitro-Bid, and others), isosorbide dinitrate (Dilatrate-SR, Isordil, Sorbitrate), and isosorbide mononitrate (Imdur, ISMO, Monoket). Nitrates are also found in some recreational drugs such as amyl nitrate or nitrite ("poppers"). Taking Sildenazinn with a nitrate medicine can cause a sudden and serious decrease in blood pressure.
During sexual activity, if you become dizzy or nauseated, or have pain, numbness, or tingling in your chest, arms, neck, or jaw, stop and call your doctor right away. You could be having a serious side effect of Sildenazinn.
Do not take Sildenazinn more than once a day. Allow 24 hours to pass between doses. Do not take Sildenazinn while also taking Sildenazinn, unless your doctor tells you to.
Contact your doctor or seek emergency medical attention if your erection is painful or lasts longer than 4 hours. A prolonged erection (priapism) can damage the penis.
Sildenazinn can decrease blood flow to the optic nerve of the eye, causing sudden vision loss. This has occurred in a small number of people taking Sildenazinn, most of whom also had heart disease, diabetes, high blood pressure, high cholesterol, or certain pre-existing eye problems, and in those who smoke or are over 50 years old. It is not clear whether Sildenazinn is the actual cause of vision loss.
Stop using Sildenazinn and get emergency medical help if you have sudden vision loss.
Active ingredient matches for Sildenazinn:
Sildenafil in Peru.
List of Sildenazinn substitutes (brand and generic names) | Sort by popularity |
| Unit description / dosage (Manufacturer) | Price, USD |
| Sildenax 50mg (Switzerland) | |
| Sildenon (Belgium) | |
| Sildenon 100mg (Luxembourg) | |
| Sildenon 50mg (Luxembourg) | |
| Silderec (Bulgaria, Peru) | |
| Silderec 100 mg (Hungary) | |
| Silderec 50 mg (Hungary) | |
| Silderm (Netherlands) | |
| Sildex (Israel, Philippines) | |
| Sildex 100 (Israel) | |
| Sildex 25 (Israel) | |
| Sildex 50 (Israel) | |
| Sildexcel (Peru) | |
| Sildofil 100 | |
| Sildofil 25 | |
| Sildofil 50 | |
| Sildora (Philippines) | |
| Sildora film-coated tab 100 mg 4's (Synmedic) | |
| Sildora film-coated tab 50 mg 4's (Synmedic) | $ 5.73 |
| Sildrem (Netherlands) | |
| Silegria (Bulgaria) | |
| Silfect (Georgia, Turkey) | |
| Silfeldrem (Netherlands, Poland) | |
| Silfil (Peru) | |
| SILNAFIL | |
| SILNAFIL 25 MG TABLET 1 strip / 10 tablets each (Emcure Pharmaceuticals Ltd) | $ 2.17 |
| Silnafil 25mg Tablet (Emcure Pharmaceuticals Ltd) | $ 0.24 |
| Silnor (Peru) | |
| Siltegra (Georgia) | |
| Silvagra (Egypt) | |
| Silvasta (New Zealand) | |
| Silvigo (Egypt) | |
| Sindex Plus (Peru) | |
| Sinegra (Georgia) | |
| Sinfidol (Peru) | |
| Sinota (Colombia) | |
| Sitrepa (Peru) | |
| Slider (Israel) | |
| Slip In | |
| Slip In 50 mg Tablet (Winsome Laboratories Ltd.) | $ 0.20 |
| Sollevare (Brazil) | |
| Sozegra (India) | |
| Sozegra 50mg TAB / 4 (Sozin Flora Pharma) | $ 0.87 |
| 50 mg x 4's (Sozin Flora Pharma) | $ 0.87 |
| Sozegra 50 mg Tablet (Sozin Flora Pharma) | $ 0.22 |
| SOZEGRA tab 50 mg x 4's (Sozin Flora Pharma) | $ 0.87 |
See 1998 substitutes for Sildenazinn | |
References
- PubChem. "sildenafil". https://pubchem.ncbi.nlm.nih.gov/com... (accessed September 17, 2018).
- DrugBank. "sildenafil". http://www.drugbank.ca/drugs/DB00203 (accessed September 17, 2018).
- MeSH. "Urological Agents". https://www.ncbi.nlm.nih.gov/mesh/68... (accessed September 17, 2018).
Reviews
The results of a survey conducted on ndrugs.com for Sildenazinn are given in detail below. The results of the survey conducted are based on the impressions and views of the website users and consumers taking Sildenazinn. We implore you to kindly base your medical condition or therapeutic choices on the result or test conducted by a physician or licensed medical practitioners.User reports
Consumer reported useful
No survey data has been collected yetConsumer reported price estimates
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Information checked by Dr. Sachin Kumar, MD Pharmacology
