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Tadalis SX 20 mg is usually taken orally, about 30–60 minutes before sex, swallowed whole with water, and should not be used more than once in 24 hours. It can be taken with or without food, and its effect can last up to about 36 hours, giving a long “window” for sexual activity as long as arousal is present. For BPH‑related symptoms (like frequent or difficult urination), a lower, daily dose is usually preferred, and Tadalis SX 20 mg is generally not used as a daily regimen.