Drilldown: Medicines

Dexmethylphenidate (1) · Ketotifen (1) · Sildenafil (1)

Focalin, Focalin XR (1) · Viagra, Revatio (1) · Zaditor, Alaway (ophthalmic, OTC); Zaditen (systemic, outside US) (1)

CNS stimulant (1) · NDRI (1) · PDE5 Inhibitor (1) · Psychostimulant (1) · [[:Category:H1_receptor_antagonists|Histamine H1 receptor antagonist]] (1) · [[:Category:Mast_cell_stabilizers|Mast cell stabilizer]] (1) · [[:Category:Ophthalmic_antihistamines|Ophthalmic antihistamine]] (1)

Norepinephrine–dopamine reuptake inhibition (DAT, NET), d-threo enantiomer of methylphenidate (1) · Selective inhibitor of phosphodiesterase type 5 (PDE5), preventing cGMP breakdown in vascular smooth muscle. In the corpus cavernosum, potentiates the NO/cGMP cascade triggered by sexual stimulation. (1) · '"`UNIQ--vote-00001284-QINU`"' Systemic oral ketotifen (available outside US) has historical use for asthma adjunct therapy via the same dual mechanism, but oral use produces sedation and weight gain — the topical ophthalmic application largely avoids both'"`UNIQ--ref-00001285-QINU`"'. (1)

'"`UNIQ--vote-00000150-QINU`"', '"`UNIQ--vote-00000151-QINU`"' (1) · '"`UNIQ--vote-00000705-QINU`"', '"`UNIQ--vote-00000706-QINU`"' (1) · '"`UNIQ--vote-00001286-QINU`"' (1)

None (1) · 50 mg ~1 h before sexual activity (ED); 20 mg TID (PAH) (1) · Ophthalmic 1 drop in each eye every 8-12 hours (1)

None (1) · 0.025%, 0.035% ophthalmic solutions (1) · 25, 50, 100 mg tabs (Viagra); 20 mg tabs and 10 mg/mL oral suspension (Revatio) (1)

None (1) · 1 drop per eye q8-12h (1) · 100 mg/d (ED); 20 mg TID (PAH) (1)

IV (Revatio) (1) · Oral (2) · Topical ophthalmic (1)

None · Hours · 30-60 minutes · 1-2 hours · ~30 min · LDL lowering at 2 weeks, max by 4 weeks · ~1 hour · 15-30 minutes · 15–30 min · 1–2 h · 30–60 min · Antidepressant effect emerges over 1-2 weeks · BP and symptomatic LUTS improvement within 1-2 weeks · BP effect within 1-2 weeks · Clinical improvement within 24-72 hours · Days · Motor improvement over days at therapeutic dose · Over weeks · Postprandial glucose effect within days; HbA1c by 12 weeks · Sleep effect from first dose; antidepressant effect over 1-4 weeks

Other values:

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8-12 hours (1) · IR 4–6 h; XR 8–12 h (1) · ~4 h (1)

2.2 h (IR parent); ~3 h (XR parent) (1) · Not meaningfully described for ophthalmic use'"`UNIQ--ref-00001287-QINU`"' (1) · ~4 h (1)

Topical with minimal systemic absorption'"`UNIQ--ref-00001288-QINU`"' (1) · ~22–25% (1) · ~40% (1)

Category B (1) · Category C (1) · Generally considered safe (minimal systemic exposure).<sup class="pcp-cn" title="This claim needs a citation.">&#91;[[Pharmacopedia:Citation needed|citation&nbsp;needed]]&#93;</sup> (1)

OTC in US (1) · Rx-only in US (1) · Schedule II (1)