Pyrimethamine is a potent inhibitor of multi-drug and toxin extrusion transporters. This compound inhibits Mdr-1(Pgp) and thus allows for active drugs to stay within the cell for longer periods of time, increasing their effectiveness by preventing efflux

Quercetin dihydrate (Sophoretin)

Quetiapine fumarate is an atypical antipsychotic used in the treatment of schizophrenia, bipolar I mania, bipolar II depression, bipolar I depression.

Quinine HCl dihydrate

Rabeprazole sodium(LY307640 sodium) is an antiulcer drug in the class of proton pump inhibitors.

Racecadotril (acetorphan), a potent enkephalinase inhibitor (IC50= 4.5 uM), protects endogenous enkephalins from degradation.

Raloxifene hydrochloride is a selective estrogen receptor modulator (SERM), binding to ERα and ERβ. Tissue-dependently blocks or activates estrogen-induced transcription. Exhibits estrogen agonist behavior in bone but acts as an anti-estrogen in breast an

RaloxifeneHcl(LY156758 Hcl) is a second generation selective estrogen receptor antagonist.

Raltegravir Salt is a potent human immunodeficiency virus (HIV) integrase inhibitor and a novel anti-AIDS drug.

Ramipril is an angiotensin-converting enzyme (ACE) inhibitor with IC50 of 5 nM.

Ranolazine (Ranexa)

Rasagiline Mesylate is an antiparkinsonian and a selective irreversible MAO-B inhibitor.

Repaglinide is a KIR6 (KATP) channel blocker that binds with high affinity for SUR1 when co-expressed with KIR6.2(Kd = 0.42 nM).

Rhein(Monorhein)

Rheochrysidin (Physcione)

Ribavirin is a guanosine analog with antiviral properties against DNA and RNA viruses, including respiratory syncytial virus, hepatitis C, and influenza.

Rifapentine (Priftin)

rifomycins

Riluzole is a glutamate antagonist used as an anticonvulsant and to prolong the survival of patients with amyotrophic lateral sclerosis.

Rimantadine (Flumadine)

Risedronate sodium is a pyridinyl biphosphonate which inhibits osteoclast-mediated bone resorption.

Risedronic acid (Actonel)