Overview
11 DESCRIPTION VISUDYNE ® (verteporfin for injection) is a sterile, photoenhancer which is light activated drug when used in photodynamic therapy for intravenous administration. The finished drug product is a lyophilized dark green cake. Verteporfin is a 1:1 mixture of two regioisomers (I and II), represented by the following structures: The chemical names for the verteporfin regioisomers are:...
Mechanism of Action
12 CLINICAL PHARMACOLOGY 12.1 Mechanism of Action VISUDYNE (verteporfin for injection) therapy is a two-stage process requiring administration of both verteporfin for injection and nonthermal red light. Verteporfin is transported in the plasma primarily by lipoproteins. Once verteporfin is activated by light in the presence of oxygen, highly reactive, short-lived singlet oxygen and reactive oxygen radicals are generated. Light activation of verteporfin results in local damage to neovascular endothelium, resulting in vessel occlusion. Damaged endothelium is known to release procoagulant and vasoactive factors through the lipoxygenase (leukotriene) and cyclooxygenase (eicosanoids such as thromboxane) pathways, resulting in platelet aggregation, fibrin clot formation and vasoconstriction.
Indications
- 1 INDICATIONS AND USAGE VISUDYNE ® (verteporfin for injection) therapy is indicated for the treatment of patients with predominantly classic subfoveal choroidal neovascularization (CNV) due to age-related macular degeneration (AMD), pathologic myopia or presumed ocular histoplasmosis. There is insufficient evidence to indicate VISUDYNE for the treatment of predominantly occult subfoveal CNV. VISUDYNE (verteporfin for injection) therapy is a photoenhancer indicated for the treatment of patients with predominantly classic subfoveal choroidal neovascularization due to age-related macular...
Common Doses
- 6 mg
- 7 mL
- 7.5 mL
- 2 mg
Dosage
2 DOSAGE AND ADMINISTRATION • Recommended Dose : 6 mg/m 2 body surface area. ( 2.2 ) • Reconstitution : Reconstitute each vial of VISUDYNE with 7 mL of Sterile Water for Injection to provide 7.5 mL containing 2 mg/mL of verteporfin. Reconstituted VISUDYNE must be protected from light and used within 4 hours. ( 2.3 ) • Dilution : Dilute desired dose of reconstituted VISUDYNE with 5% Dextrose for Injection to a total infusion volume of 30 mL. ( 2.3 ) • Infusion : Administer intravenously over 10 minutes at a rate of 3 mL/minute, using an appropriate syringe pump and in-line filter. ( 2.
Contraindications
- 4 CONTRAINDICATIONS VISUDYNE (verteporfin for injection) is contraindicated for patients with porphyria or a known hypersensitivity to any component of this preparation [see Adverse Reactions ( 6 )] . VISUDYNE (verteporfin for injection) is contraindicated for patients with porphyria or a known hypersensitivity to any component of this preparation. ( 4 )
Side Effects
- 6 ADVERSE REACTIONS The following serious adverse reactions are described elsewhere in the labeling: • Local Adverse Reactions – Extravasation [see Warnings and Precautions ( 5.1 )] • Exposure to Sun or Direct Light [see Warnings and Precautions ( 5.2 )] • Decreased Vision after Treatment [see Warnings and Precautions ( 5.3 )] • Porphyria and Hypersensitivity [see Contraindications ( 4 )] Most common adverse reactions (incidence ˃10%) are injection site reactions and visual disturbances. ( 6.
Interactions
- 7 DRUG INTERACTIONS Drug interaction studies in humans have not been conducted with VISUDYNE. Verteporfin is rapidly eliminated by the liver, mainly as unchanged drug. Metabolism is limited and occurs by liver and plasma esterases. Microsomal cytochrome P450 does not appear to play a role in verteporfin metabolism. Based on the mechanism of action of verteporfin, many drugs used concomitantly could influence the effect of VISUDYNE therapy.