sildenafil (pulmonary hypertension) 10 mg/12.5 mL intravenous solution
For erectile dysfunction, sildenafil produces its maximum effects for about two hours and can still produce an erectile response four hours after a dose is taken.
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Healthcare professionals do not use sildenafil injections in pediatric patients. When sildenafil is used for pulmonary hypertension, no dosage reductions are required for people with kidney disease or liver problems. However, men using higher-dose sildenafil for erectile dysfunction will be started on the lowest possible dose if they have severe kidney or liver impairment, or are over the age of 65. Although the starting dose is lower than normal, the dose can eventually be increased to the maximum dosage if there are no issues with side effects. Patients with renal impairment (creatinine clearance <30 mL/min): Starting dose reduced to 25 mg per day for erectile dysfunction treatment Patients with renal impairment (creatinine clearance <30 mL/min): Starting dose reduced to 25 mg per day for erectile dysfunction treatment Patients with hepatic impairment: Starting dose reduced to 25 mg per day for erectile dysfunction treatment (no dosage adjustment for pulmonary hypertension) Patients with hepatic impairment: Starting dose reduced to 25 mg per day for erectile dysfunction treatment (no dosage adjustment for pulmonary hypertension) Patients over 65 years of age: Starting dose reduced to 25mg per day for erectile dysfunction treatment Patients over 65 years of age: Starting dose reduced to 25mg per day for erectile dysfunction treatment Veterinarians use sildenafil to reduce blood pressure in dogs and cats diagnosed with pulmonary hypertension.
Is 20 or 25mg Sildenafil Enough for ED?
They’re more likely to use it when pets are showing symptoms like sildenafil 45 mg chewable tablets fainting and other signs of heart failure. Some veterinarians may use it if a pet also has heart disease, heart failure, or lung disease. Dosage guidelines vary, ranging between doses of 0.5 mg to 3 mg/kg given anywhere from once per day to three times per day. Although sildenafil has three dosage forms, erectile dysfunction is treated only with sildenafil tablets. For pulmonary hypertension, pediatric patients and adults who can’t swallow a tablet may be prescribed sildenafil oral suspension.
Related treatment guides
Sildenafil injections are administered by a healthcare provider only. Your healthcare provider will tell you how much sildenafil to take and how often it can be taken. Please read the Patient Information sheet that comes with this medicine. For erectile dysfunction:Take the prescribed dose about one hour before you have sex.The dose can be taken one-half hour to four hours before sexual activity.Do not take more than one dose a day. Allow at least 24 hours between doses.Store sildenafil tablets at room temperature. For pulmonary hypertension, sildenafil’s benefits in lowering blood pressure were the same as a placebo (inert pill) after eight hours. For treatment of erectile dysfunction, take only one dose per day.
- Sildenafil 12.5 mg is a lower dose used for mild erectile dysfunction.
- It helps relax blood vessels to increase blood flow.
- Often prescribed when starting treatment or for lighter symptoms.
If a dose has been forgotten, take it when remembered but wait at least 30 minutes before attempting sexual activity.
- Store sildenafil at room temperature, away from moisture and heat.
- Keep out of reach of children and pets.
- Do not use expired medication; freshness ensures safety and efficacy.
For pulmonary hypertension, take a missed dose as soon as you remember it. If it’s almost time for the next dose, skip the missed dose and take the next dose as scheduled.
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If too much sildenafil is taken, get immediate medical attention. Side effects of sildenafil, such as headache, flushing, stomach upset, nasal congestion, back pain, low blood pressure, or painful erections (priapism), are more likely and could be worse than normal.
Sildenafil Side Effects and Adverse Reactions
Tablets are taken at least one hour before anticipated sexual activity, but men could take their dose a half hour to four hours before sexual activity. However, a dose starts to lose its potency about two hours after a dose is taken. Sexual stimulation is required for the drug to work. Men will start on a 50 mg dose which can rise to 100 mg if necessary. Standard sildenafil dosage for erectile dysfunction: 25–100 mg tablet taken only once daily at least one hour before sexual activity Standard sildenafil dosage for erectile dysfunction: 25–100 mg tablet taken only once daily at least one hour before sexual activity Maximum sildenafil dosage for erectile dysfunction: 100 mg daily Maximum sildenafil dosage for erectile dysfunction: 100 mg daily Pulmonary hypertension is when the blood pressure in the arteries of the lungs is higher than normal.
Sexual Dysfunction (Related to Antidepressant Use)
This makes the heart work harder to pump blood through the lungs. This can lead to heart damage and cause symptoms such as shortness of breath, chest pain, and lightheadedness. Pulmonary hypertension affects about 1% of the population. Pulmonary hypertension has many potential causes, including heart disease, lung disease, medications, and other health conditions. Physicians will focus on treating those problems, but they will also use drugs like sildenafil to lower blood pressure.
Dosage Modifications
Sildenafil is taken orally three times daily and can range from 60 mg to 240 mg. Sildenafil injections are limited to 30 mg per day. For pulmonary hypertension, people may be prescribed generic sildenafil or a brand-name version called Revatio. Standard sildenafil dosage for pulmonary hypertension: 20–80 mg taken orally three times daily OR 10 mg intravenous injection three times daily Standard sildenafil dosage for pulmonary hypertension: 20–80 mg taken orally three times daily OR 10 mg intravenous injection three times daily Maximum sildenafil dosage for pulmonary hypertension: 240 mg taken orally OR 30 mg daily administered as intravenous injections Maximum sildenafil dosage for pulmonary hypertension: 240 mg taken orally OR 30 mg daily administered as intravenous injections Healthcare professionals use sildenafil to treat pulmonary hypertension in children as young as 1 year old. Children can take tablets or an oral suspension. Serious side effects are also possible such as heart rate problems, chest pain (angina), and heart attack.
2.1 Recommended Dosage in Adults
Store sildenafil oral suspension in the refrigerator. Throw away any unused medicine 60 days after receiving it from the pharmacist or on the expiration date written on the bottle’s label. In clinical trials, sildenafil showed significant effects on erectile response 60 minutes after the dose was taken, though the effects may be evident within 30 minutes. For pulmonary hypertension, sildenafil lowers blood pressure about one to two hours after a dose is taken. With a half-life of four hours, sildenafil and its active metabolite are completely cleared from the system in about 20 hours, though the effects fade before then. Do not take sildenafil if you are using medications called nitrates, such as nitroglycerin, or over-the-counter nitrites (“poppers”), such as amyl nitrite. Sildenafil should also never be combined with heart failure drugs called guanylate cyclase stimulators (riociguat or vericiguat).
| Parameter | Values | Notes |
|---|---|---|
| Absorption | Rapid | Peak plasma levels in approximately 30-60 min |
| Bioavailability | Approximately 40% | Due to first-pass metabolism |
| Half-life | About 4-5 hours | Duration of action may vary |
| Metabolism | Liver via CYP3A4 and CYP2C9 | Major pathways |
Make sure the prescriber knows about all drugs and substances you use, including vitamins, supplements, and illicit substances.
Proper Use
Always measure the dose with the oral syringe provided in the package. Do not mix the dose with other liquids or flavorings. The person getting the sildenafil premature ejaculation medicine should be upright. Place the syringe in the mouth against the cheek. Wash the syringe with water and allow it to dry after each use. To avoid more serious drug interactions, the prescriber will need to know about: Other ED drugs or supplements, particularly Cialis (tadalafil) or vardenafil Other ED drugs or supplements, particularly Cialis (tadalafil) or vardenafil HIV/AIDS drugs called protease inhibitors, especially ritonavir HIV/AIDS drugs called protease inhibitors, especially ritonavir Oral antifungal drugs such as ketoconazole or itraconazole Oral antifungal drugs such as ketoconazole or itraconazole To reduce the risk of side effects, avoid drinking grapefruit juice when taking sildenafil.
5.8 Vaso-occlusive Crisis in Patients with Pulmonary Hypertension Secondary to Sickle Cell Disease
Take the prescribed dose about one hour before you have sex. The dose can be taken one-half hour to four hours before sexual activity. Do not take more than one dose a day. Allow at least 24 hours between doses. For pulmonary arterial hypertension:Take or administer the prescribed dose three times a day, four to six hours apart.
Oral Administration
Take or administer the prescribed dose three times a day, four to six hours apart. How to take sildenafil oral suspension for pulmonary hypertension:Please read and follow the Instructions for Use.Do not use the medicine if it’s still in powder form, doesn’t have a bottle adapter, or is missing an oral syringe. The pharmacist can provide a bottle adapter or oral syringe.Shake the bottle well for at least 10 seconds.Always measure the dose with the oral syringe provided in the package.Do not mix the dose with other liquids or flavorings.The person getting the medicine should be upright.Place the syringe in the mouth against the cheek. Push the plunger completely down.Wash the syringe with water and allow it to dry after each use.Store sildenafil oral suspension in the refrigerator. Do not freeze.Throw away any unused medicine 60 days after receiving it from the pharmacist or on the expiration date written on the bottle’s label.
Efficacy of topical sildenafil formulations in enhancing wound healing outcomes: a narrative review
How to take sildenafil oral suspension for pulmonary hypertension: Please read and follow the Instructions for Use. Please read and follow the Instructions for Use. Do not use the medicine if it’s still in powder form, doesn’t have a bottle adapter, or is missing an oral syringe. The pharmacist can provide a bottle adapter or oral syringe. Shake the bottle well for at least 10 seconds. Although there isn’t much information about the safety of sildenafil during pregnancy, animal studies have shown no adverse effects on a fetus. Pregnant women or women who are breastfeeding should ask for medical advice before taking sildenafil. Plumb’s Veterinary Drug Manual, 7 edition Plumb’s Veterinary Drug Manual, 7 edition Revatio prescribing information, DailyMed (NIH National Library of Medicine) Revatio prescribing information, DailyMed (NIH National Library of Medicine) Sildenafil citrate powder for oral suspension prescribing information, DailyMed (NIH National Library of Medicine) Sildenafil citrate powder for oral suspension prescribing information, DailyMed (NIH National Library of Medicine) Systemic and pulmonary hypertension in dogs and cats, Merck Veterinary Manual Systemic and pulmonary hypertension in dogs and cats, Merck Veterinary Manual Viagra drug summary, Prescriber’s Digital Reference (PDR) Viagra drug summary, Prescriber’s Digital Reference (PDR) Viagra sildenafil citrate tablet prescribing information, DailyMed (NIH National Library of Medicine) Viagra sildenafil citrate tablet prescribing information, DailyMed (NIH National Library of Medicine) Jessica Swirble, Pharm.D., is a 2007 graduate of the Philadelphia College of Pharmacy and has more than 16 years of experience as a pharmacist.
| Medication Type | Interaction Effect | Recommended Action |
|---|---|---|
| Nitrates | Severe hypotension | Avoid concurrent use |
| Alpha-blockers | Blood pressure lowering effects | Monitor blood pressure closely |
| CYP3A4 inhibitors | Increased sildenafil levels, risk of side effects | Dose adjustment or caution |
| Other PDE5 inhibitors | Enhanced effects, risk of adverse reactions | Avoid combination |