You should ask for tadalafil if you want longer duration (up to 36 hours) and flexibility for spontaneous activity, but choose sildenafil if you prefer a faster onset (30–60 minutes) and a shorter window in your system (4–6 hours). Key Differences to Decide Which to Ask For Feature Sildenafil (Viagra) Tadalafil (Cialis) Duration 4–6 hours [2][3] Up to 36 hours ("weekend pill") [2][3][5] Onset 30–60 minutes [3][8] 30–120 minutes (slower peak) [3][8] Dosing On-demand only [2][5] On-demand or daily low-dose (5mg) [3][5][9] Food/Alcohol Affected by food [2] No significant food interaction [4][8] Extra Uses Pulmonary hypertension [7] Benign prostatic hyperplasia (BPH) [7][9] Side Effects More likely to cause visual changes [3] More likely to cause indigestion [7] Preference Lower cost; good for occasional use [5][8] Preferred by most patients due to duration [1][2][3] Recommendation: Ask for tadalafil if you want spontaneity, frequent sexual activity, or have BPH symptoms [2][5][9]. Ask for sildenafil if you want the fastest effect, occasional use, or lowest cost [5][8]. Many doctors suggest trying both to see which works better for you, as efficacy is comparable but side effects vary [1][6]. Services Offering Both LloydsPharmacy Online Doctor (UK): Safely offers both sildenafil and tadalafil online with a consultation [2]. The Independent Pharmacy (UK): Provides both medications with guidance on selection [3]. Asda Online Doctor (UK): Offers both options with comparison details [5]. GoodRx (US): Lists both as lower-cost generics and helps compare prices [7]. DC Urology (US): Recommends trying both to determine individual response [6]. Check your country’s availability and consult a healthcare provider before starting either medication, as both can interact with heart/blood pressure drugs [7].
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