Questions about adderall salts 20 mg

Patient: Hello,I m 23 years old maleI have been recently diagnosed with ADHD (before 4 months ago)My doctor gave me adderall salts 20 mgMy questionsIs adderall may cause sexual problem ?When should I stop taking adderal ? (How can I know it became danger to my health ?)Should I take it on empty stomach or on full stomach ?