Caverta contains sildenafil as its active component. Sildenafil is a phosphodiesterase-5 (PDE5) inhibitor that is prescribed for the treatment of erectile dysfunction (ED). Caverta is supplied as a oral pill and is available in strengths of 50 mg and 100 mg. In Hong Kong, the product is classified as a prescription-only medication and must be dispensed by a licensed pharmacist after a qualified healthcare professional’s authorization.
Sildenafil works by blocking the enzyme phosphodiesterase-5, which normally breaks down cyclic guanosine monophosphate (cGMP) in the smooth muscle of the penile arteries. By inhibiting PDE5, Caverta allows cGMP to accumulate, leading to smooth-muscle relaxation and increased blood flow into the corpora cavernosa during sexual stimulation. This physiological response facilitates the achievement and maintenance of an erection. The drug has an oral onset of action typically within 30-60 minutes, peaks at about 1 hour, and its effects can last for up to 4-5 hours. Sildenafil is metabolized primarily by the liver enzyme CYP3A4 and has a plasma half-life of approximately 4 hours.
Caverta is approved by the Hong Kong Department of Health for the treatment of erectile dysfunction in adult men. Erectile dysfunction is defined as the persistent inability to attain or sustain an erection sufficient for satisfactory sexual performance. The medication is intended for use in men who have a physiological basis for ED and who are able to achieve sexual stimulation, as the drug does not initiate an erection in the absence of sexual arousal.
Absolute contraindications
Known hypersensitivity to sildenafil or any of the pill’s inactive ingredients.
Concurrent use of nitrate medications (e.g., nitroglycerin, isosorbide dinitrate) because of the risk of severe hypotension.
Individuals with a history of non-arteritic anterior ischemic optic neuropathy (NAION).
Relative contraindications
Uncontrolled hypertension or recent cardiovascular events (myocardial infarction, stroke) within the past 6 weeks.
Severe hepatic impairment (Child-Pugh Class C) or severe renal impairment (creatinine clearance <30 mL/min).
Use of certain alpha-blockers (e.g., prazosin) where blood-pressure monitoring is required.
Pregnancy, lactation, or women of childbearing potential (sildenafil is not indicated for these groups).
Special populations
Elderly patients may require lower initial doses (50 mg) and close monitoring for blood-pressure changes.
Patients with moderate liver or kidney disease should begin with the lowest available dose and may need dose adjustments.
If any of these conditions apply, a healthcare provider should assess suitability before prescribing Caverta.
These effects are typically self-limiting and resolve without medical intervention. If they persist or worsen, contacting a healthcare professional is advisable.
Black-box warnings associated with sildenafil emphasize the risk of hypotension when combined with nitrates and the potential for priapism.
Patients should disclose all prescription medicines, over-the-counter products, and herbal supplements before initiating Caverta.
If specific interaction data for Caverta are limited, the same precautions applicable to other sildenafil-containing products should be followed.
Standard dosing - The usual starting dose for most men is 50 mg taken as a single oral pill about 30 minutes to 1 hour before anticipated sexual activity.
Dose adjustment - Based on efficacy and tolerability, the dose may be increased to 100 mg or decreased to 25 mg (if available) after a minimum of 24 hours. The maximum recommended frequency is once per day.
Special populations -
Renal impairment: For creatinine clearance 30-50 mL/min, start with 50 mg; avoid use if clearance is <30 mL/min unless directed by a specialist.
Hepatic impairment: For moderate liver disease, a 50 mg dose is advised; avoid in severe disease.
Elderly: Consider initiating at 50 mg with careful blood-pressure monitoring.
Administration guidelines - Swallow the pill whole with a glass of water; do not crush, chew, or split the tablet unless specifically instructed.
Missed dose - If an erection is not achieved, a missed dose should be ignored; do not take an additional pill to “make up” for it.
Overdose - Symptoms may include severe hypotension, dizziness, prolonged erection, or visual disturbances. Seek emergency medical attention; treatment is supportive, and there is no specific antidote.
Discontinuation - No tapering is required. The medication can be stopped abruptly, but patients should discuss any concerns with their provider.
All dosing decisions must be individualized by a qualified healthcare professional.
Routine clinical follow-up is recommended to assess treatment efficacy, blood-pressure response, and the presence of any adverse effects. In patients with cardiovascular comorbidities, periodic evaluation of heart health (e.g., ECG, stress testing) may be warranted before initiating therapy. Laboratory monitoring of liver or kidney function is advisable for individuals with known organ impairment.
This article provides educational information about Caverta and is not a substitute for professional medical advice. Treatment decisions, including use for unapproved indications, must be made under the guidance of a qualified healthcare provider. The content is intended for informational purposes and does not constitute medical recommendations. Always consult a physician before starting, stopping, or changing any medication regimen.
Sildenafil can be used by men with well-controlled hypertension, but uncontrolled high blood pressure should be managed before starting therapy. Blood-pressure monitoring is advisable after the first dose.
A high-fat meal may delay the onset of action by up to two hours. For faster onset, it is recommended to take the pill on an empty stomach or with a light meal.
This condition, called priapism, requires immediate medical attention. Visit the nearest emergency department or call emergency services without delay.
Certain herbal products containing nitrates (e.g., some types of poppy seed supplements) or potent CYP3A4 inhibitors such as St. John’s wort may interact. Discuss all supplement use with your pharmacist.
Moderate alcohol consumption generally does not interfere with efficacy, but excessive drinking can increase the risk of dizziness and lower blood pressure. Use alcohol responsibly.
Older men can use Caverta, usually starting at the 50 mg dose. Individual health status, especially cardiovascular health, should be evaluated by a healthcare provider.
Caverta and other sildenafil-based products contain the same active ingredient, so their efficacy and safety profiles are comparable. Differences may exist in inactive ingredients, tablet appearance, and pricing.
Caverta is taken only when sexual activity is anticipated. If a dose is missed, simply skip it and plan the next dose for the following occasion; do not double-dose.
Men with diabetes can take Caverta, but they should have good glycaemic control and be screened for cardiovascular disease, as diabetes can increase the risk of erectile dysfunction and related complications.
