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Footnotes ?1 Abbreviations: PDE, phosphodiesterase; cAMP, adenosine 3?5?-cyclic monophosphate; cGMP, guanosine 3?5?-cyclic monophosphate; GAF, cyclic GMP, adenylyl cyclase, FhlA; CaM, calmodulin; PK, protein kinase; PKA, cAMP-dependent protein kinase; PKG, cGMP-dependent protein kinase; CNS, central nervous system; ANP, atrial natriuretic peptide; NO, nitric oxide; PDP, 9-(6-phenyl-2-oxohex-3-yl)-2-(3,4-dimethoxybenzyl)-purin-6-one; BAY 60-7750, 2-(3,4-dimethoxybenzyl)-7-[(1R)-1-hydroxyethyl]-4-phenylbutyl]-5-methylimidazo[5,1-f] [1,2,4]triazin-4(3H)-one; PI3K, phosphatidylinositol 3-kinase; IGF1, insulin-like growth factor 1; OPC-33450, 6-[3-[3-cyclooctyl-3-[(1R*,2R*)-2-hydroxycyclohexyl]ureido]-propoxy]-2(1H)-quinolinone; UCR, upstream conserved region; CRE, cAMP-responsive element-binding protein; RACK, receptor for activated C-kinase 1; AKAP, A-kinase anchoring proteins; ERK, extracellular signal-regulated kinase; BRL 50481, 3-(N,N-dimethylsulfonamido)-4-methyl-nitrobenzene; PAS, Period, Arnt, and Sim; IBMX, 3-isobutyl-1-methylxanthine; BAY 73-6691, 1-(2-chlorophenyl)-6-[(2R)-3,3,3-trifluoro-2-methylpropyl]-1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidine-4-one. ED can in many cases be treated by drugs taken orally, injected, or as penile suppositories. These drugs increase the efficacy of NO, which dilates the blood vessels of corpora cavernosa. When oral drugs or suppositories fail, injections (e.g. of apomorphine) into the erectile tissue of the penile shaft may work. By Steven Reinberg HealthDay Reporter Here you can buy viagra without prescription brand viagra without prescription online "Our findings substantiate benefits for the dystrophic heart using a pharmacological approach, namely with sildenafil, which is safe, well-tolerated and currently available for clinical use," Des Rosiers said. "Hence, this could provide the basis for a new avenue for the treatment. Furthermore, the benefits of this therapeutic approach would be expected to extend beyond the heart to affected skeletal muscle and other tissues."