Tadalafil C20 is a PDE5 inhibitor designed for the treatment of:
Erectile Dysfunction (ED)
Benign Prostatic Hyperplasia (BPH)
Tadalafil improves erectile function by increasing blood flow to the penis in response to sexual stimulation and reduces symptoms of BPH, such as difficulty in starting urine flow and the need to urinate frequently.
DOSAGE AND ADMINISTRATION
Recommended Dose:
Starting dose for ED: 10 mg, taken before anticipated sexual activity.
Adjustments: Decrease to 5 mg or increase to 20 mg, based on tolerance and efficacy.
Maximum frequency: Once per day.
Duration of Effectiveness: Up to 36 hours after dosing.
Food Interaction: Can be taken with or without food.
CONTRAINDICATIONS
Not for Use In:
Females or pediatric patients.
Patients on organic nitrates (risk of severe hypotension).
Cardiovascular Risk: Avoid if sexual activity is inadvisable due to heart conditions.
WARNINGS AND PRECAUTIONS
Hypotension: Avoid combining with alpha-blockers, antihypertensives, or substantial alcohol intake.
Priapism: Seek emergency care for erections lasting longer than 4 hours.
Vision Loss: Discontinue immediately if sudden vision loss occurs, which may indicate NAION (non-arteritic anterior ischemic optic neuropathy).
Hearing Loss: Sudden decrease or loss of hearing requires discontinuation and medical attention.
Pre-existing Conditions: Caution in patients with:
Cardiovascular disease.
Predisposition to priapism.
History of NAION or severe hepatic/renal impairment.
USE IN SPECIFIC POPULATIONS
Older Adults:
No major differences in safety or efficacy between individuals over 65 years and younger individuals.
Hepatic Impairment:
Use cautiously in mild to moderate impairment (Child-Pugh A/B).
Insufficient data for severe impairment (Child-Pugh C).
Renal Impairment:
Exposure increases in cases of reduced creatinine clearance (30–80 m L/min).
Higher exposure in end-stage renal disease on dialysis.
ADVERSE REACTIONS
Common Side Effects (>2%):
Headache, back pain, nasal congestion, flushing, myalgia, pain in limbs, dyspepsia.
Less Common Side Effects (<1%):
Gastroesophageal reflux, nausea, vomiting, upper abdominal pain, muscle spasms, and arthralgia.
Back Pain/Myalgia:
Occurs 12–24 hours post-dose, resolves within hours or days.
Usually mild to moderate; severe cases are rare (<5%).
Management:
Use of acetaminophen or NSAIDs is generally effective.
Narcotics are rarely required.
DRUG INTERACTIONS
Potential Interactions with Tadalafil:
Nitrates:
Contraindicated; severe hypotension may occur. Wait at least 48 hours before administering nitrates post-Tadalafil.
Alpha-Blockers:
Increased risk of blood pressure drops.
Alcohol:
Large quantities combined with Tadalafil may cause dizziness, headache, and orthostatic hypotension.
Antacids:
May slow Tadalafil absorption but does not reduce effectiveness.
CYP3A4 Inhibitors:
Drugs like ketoconazole, erythromycin, and grapefruit juice increase Tadalafil exposure.
CYP3A4 Inducers:
Rifampin reduces Tadalafil exposure by 88%.
OVERDOSAGE
Symptoms: Similar to lower doses but may require medical attention.
Treatment: Supportive measures; hemodialysis is ineffective in eliminating Tadalafil.
STORAGE
Store below 30°C in a cool, dry place, away from direct sunlight.
Keep out of reach of children.
SUMMARY
Tadalafil C20 is an effective treatment for ED and BPH, offering long-lasting results of up to 36 hours. While generally safe, it must be used cautiously in individuals with underlying health conditions, especially cardiovascular or hepatic/renal issues. Avoid combining with nitrates or excessive alcohol, and always follow dosage guidelines to minimize the risk of adverse effects.
