OPTICA SOFTGEL CAPSULES

Indications

• Hypertension
• Benign prostatic hyperplasia
• Urinary retention related to prostate enlargement

Dosage

Children: Refer to the BNF for Children for appropriate dosing guidelines in the paediatric population.

Adults: Refer to the BNF for specific dosing recommendations based on individual clinical scenarios.

Mechanism of action

Alpha acts by selectively blocking alpha-1 adrenergic receptors, which are responsible for mediating vasoconstriction in blood vessels. By inhibiting these receptors, alpha promotes vasodilation, leading to a decrease in peripheral vascular resistance and subsequently lowering blood pressure. Additionally, this action can help alleviate urinary symptoms associated with an enlarged prostate.

Pharmacodynamics

The pharmacodynamics of alpha involve its competitive antagonism at alpha-1 adrenergic receptors, resulting in decreased vasoconstriction and increased blood flow. This mechanism is beneficial in conditions characterized by high blood pressure and urinary retention due to prostatic enlargement. The onset of action typically occurs within hours, with peak effects observed within a few days of consistent dosing.

Pharmacokinetics

Alpha is absorbed well from the gastrointestinal tract, with peak plasma concentrations achieved within 1-3 hours post-administration. The drug undergoes hepatic metabolism, primarily via cytochrome P450 enzymes, resulting in active and inactive metabolites. The elimination half-life varies, but it generally is around 6-12 hours, allowing for once-daily dosing in many cases. Renal excretion is a significant route for its metabolites, necessitating caution in patients with renal impairment.

Interactions

• maois, irreversible + alpha blockers: Severe (increases effects)
• ribociclib + alpha blockers: Severe (increases exposure)
• cobicistat + alpha blockers: Moderate (increases exposure)
• idelalisib + alpha blockers: Moderate (increases exposure)
• dronedarone + alpha blockers: Unknown (increases exposure)
• antifungals, azoles + alpha blockers: Unknown (increases exposure)
• crizotinib + alpha blockers: Unknown (increases exposure)
• imatinib + alpha blockers: Unknown (increases exposure)
• letermovir + alpha blockers: Unknown (increases exposure)
• clarithromycin + alpha blockers: Unknown (increases exposure)

Indications

• Erectile dysfunction
• Reduced libido
• Sexual performance enhancement
• Aphrodisiac support

Dosage

Children: Not recommended for use in children; consult a healthcare provider for further information.

Adults: Refer to specific product guidelines as doses may vary based on formulation; consult a healthcare provider for personalized dosing.

Mechanism of action

The mechanisms of action for products marketed as 'erecta' may involve several pathways, including the enhancement of nitric oxide production, which promotes vasodilation and increased blood flow to the genital area. Some herbal components may also influence hormone levels, particularly testosterone, contributing to improved sexual function.

Pharmacodynamics

Pharmacodynamics of erecta products generally involves the modulation of various neurotransmitters and hormones that affect sexual arousal and erectile function. The specific effects depend on the active ingredients, which may include natural compounds that exhibit aphrodisiac properties, support endothelial function, and promote relaxation of smooth muscle in the penile tissue.

Pharmacokinetics

The pharmacokinetics of erecta products can vary widely, influenced by the formulation and the bioavailability of active compounds. Absorption rates, distribution throughout the body, metabolism in the liver, and excretion can all differ based on the constituents used, leading to a lack of standardized pharmacokinetic profiles.

Pregnancy

Erecta should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.

Breast-feeding

Caution is advised when administering Erecta during breastfeeding, as its effects on a nursing infant are unknown.

Storage

Store in a cool, dry place away from direct sunlight and moisture.

Indications

• Herbal medicine
• Aromatherapy
• Culinary uses
• Cosmetic applications
• Traditional medicine

Dosage

Children: Refer to specific herbal or medicinal guidelines for dosage in children, as this varies widely depending on the species and intended use.

Adults: Refer to specific herbal or medicinal guidelines for dosage, as this varies widely depending on the species and intended use.

Mechanism of action

The mechanism of action of flowers varies widely among species and the specific compounds they produce. Many flowers contain phytochemicals that can have pharmacological effects, such as flavonoids, alkaloids, and essential oils. These compounds can interact with biological pathways, modulating processes such as inflammation, oxidative stress, and microbial activity.

Pharmacodynamics

The pharmacodynamics of flower-derived compounds are diverse, often depending on the specific chemical constituents present. For instance, flavonoids found in many flowers may exhibit antioxidant properties, while alkaloids can act on the central nervous system. The effects of these compounds can vary significantly based on dosage, route of administration, and individual patient factors.

Pharmacokinetics

The pharmacokinetics of flower extracts and their active constituents involve absorption, distribution, metabolism, and excretion processes that can differ greatly among various compounds. Generally, compounds are absorbed through the gastrointestinal tract when ingested, with bioavailability affected by factors like solubility and the presence of other food substances. Metabolism typically occurs in the liver, with excretion primarily via urine or feces.

Pregnancy

The use of flowers, particularly those with psychoactive properties, should be approached with caution during pregnancy due to potential risks to fetal development.

Breast-feeding

Due to limited data on the transfer of flower constituents into breast milk, caution is advised. It is recommended to consult a healthcare professional before use.

Storage

Store in a cool, dry place away from direct sunlight. Ensure that products are kept out of reach of children.

Indications

• Age-related Macular Degeneration (AMD)
• Cataract prevention
• General eye health maintenance

Dosage

Children: Refer to the BNF for Children for specific dosing recommendations.

Adults: Refer to the BNF for specific dosing recommendations.

Mechanism of action

Lutein exhibits antioxidant activity by reacting with active oxygen species, producing biologically active degradation products. It inhibits the peroxidation of membrane phospholipids and reduces lipofuscin formation. Lutein filters out potentially phototoxic blue light and near-ultraviolet radiation in the macula, helping to quench reactive oxygen species and providing stability against pro-oxidants. It also increases the expression of connexin-43, enhancing gap junctional communication, which may contribute to its anti-cancer properties.

Pharmacodynamics

Lutein is concentrated in the macula, the area responsible for central vision, where it plays a crucial role in protecting against oxidative stress and high-energy light. Increased macular pigmentation from lutein intake has been associated with a decreased risk of eye diseases, particularly AMD.

Pharmacokinetics

Lutein is primarily absorbed in the gastrointestinal tract, with its bioavailability influenced by dietary fats. It is transported in the bloodstream, where it binds to lipoproteins and is distributed to various tissues, including the retina and lens. The elimination half-life and specific metabolic pathways of lutein remain to be fully elucidated.

Pregnancy

Lutein is generally considered safe during pregnancy as it is a natural component found in various fruits and vegetables, but pregnant women should consult a healthcare provider before starting any supplement.

Breast-feeding

Lutein is also generally considered safe during breastfeeding, as it is naturally present in breast milk, but nursing mothers should seek advice from a healthcare professional before supplementation.

Storage

Store in a cool, dry place away from light. Keep out of reach of children.

Formulations

• Capsules
• Softgels
• Powders
• Tablets

Indications

• Diabetic neuropathy
• Oxidative stress-related disorders
• Metabolic syndrome
• Weight management
• Liver health

Dosage

Children: Refer to specific product guidelines, as safety and efficacy in children have not been established.

Adults: Refer to specific product guidelines, as dosages may vary based on the formulation and indication.

Mechanism of action

Lipoic acid acts as a cofactor for mitochondrial enzyme complexes, particularly those involved in the Krebs cycle, enhancing energy production. It also possesses antioxidant properties, neutralizing free radicals and regenerating other antioxidants such as vitamins C and E. Additionally, lipoic acid can modulate various signaling pathways, including those related to insulin sensitivity and inflammation.

Pharmacodynamics

Lipoic acid has a dual role as a coenzyme and an antioxidant. By participating in the decarboxylation of alpha-keto acids, it aids in energy production. Its antioxidant properties contribute to the protection of cells from oxidative stress, which is implicated in various chronic diseases. Lipoic acid can improve insulin sensitivity, making it beneficial in managing glucose metabolism disorders.

Pharmacokinetics

After oral administration, lipoic acid is absorbed in the gastrointestinal tract, with peak plasma concentrations occurring within 30 to 60 minutes. It undergoes hepatic metabolism, primarily via reduction and conjugation, resulting in various metabolites. The elimination half-life is approximately 30 minutes to 2 hours, and it is excreted primarily in urine. The bioavailability of lipoic acid can be affected by food intake.

Adverse effects

• Nausea
• Vomiting
• Abdominal pain
• Skin rash
• Hypoglycemia

Interactions

• May enhance the effects of insulin and other antidiabetic medications
• May interact with heavy metal chelators

Precautions

• Use with caution in patients with diabetes due to the risk of hypoglycemia
• Monitor blood sugar levels in diabetic patients

Pregnancy

Safety during pregnancy has not been established; use only if clearly needed.

Breast-feeding

It is not known whether lipoic acid is excreted in human breast milk; caution is advised.

Storage

Store in a cool, dry place away from light.

Formulations

• Capsules
• Tablets
• Injectable solutions

Indications

• Age-related macular degeneration
• Eye health supplementation
• Antioxidant support

Dosage

Children: Refer to the BNF for Children for specific dosing recommendations.

Adults: Refer to the BNF for specific dosing recommendations.

Mechanism of action

Zeaxanthin acts as a light filter in the retina, protecting the eyes from harmful high-energy light waves like ultraviolet rays. It is believed to neutralize free radicals and reduce oxidative stress, which can contribute to various ocular diseases. Additionally, zeaxanthin is involved in the carotenoid biosynthesis pathways, including its conversion from violaxanthin and its role in various biosynthetic processes.

Pharmacodynamics

Zeaxanthin exhibits antioxidant activity, which helps protect cells from oxidative damage. It is selectively deposited in the macula of the eye, where it contributes to visual acuity and may prevent photochemical damage caused by light exposure. Its presence in the retina aids in filtering blue light and supports overall retinal health.

Pharmacokinetics

Zeaxanthin is absorbed in the gastrointestinal tract after dietary intake, with peak plasma concentrations occurring several hours post-ingestion. It is transported in the bloodstream bound to lipoproteins, and its bioavailability can vary based on dietary fat presence. The half-life of zeaxanthin in the body is not well established but is believed to be several days, as it is stored in the retina and other tissues.

Pregnancy

There is insufficient data on the safety of zeaxanthin during pregnancy. Consult a healthcare provider for advice.

Breast-feeding

Limited data is available on the excretion of zeaxanthin in human milk. Consult a healthcare provider for guidance.

Storage

Store in a cool, dry place, away from direct sunlight.

Formulations

• Dietary supplements
• Ophthalmic preparations

Mechanism of action

Xanthophylls have antioxidant activity and react with active oxygen species, producing biologically active degradation products. They also can inhibit peroxidation of membrane phospholipids and reduce lipofuscin formation, both of which contribute to their antioxidant properties. Lutein is naturally present in the macula of the human retina. It filters out potentially phototoxic blue light and near-ultraviolet radiation from the macula. The protective effect is due in part, to the reactive oxygen species quenching ability of these carotenoids. Lutein is more stable to decomposition by pro-oxidants than are other carotenoids such as beta-carotene and lycopene. Lutein is abundant in the region surrounding the fovea, and lutein is the predominant pigment at the outermost periphery of the macula. Zeaxanthin, which is fully conjugated (lutein is not), may offer somewhat better protection than lutein against phototoxic damage caused by blue and near-ultraviolet light radiation. Lutein is one of only two carotenoids that have been identified in the human lens, may be protective against age-related increases in lens density and cataract formation. Again, the possible protection afforded by lutein may be accounted for, in part, by its reactive oxygen species scavenging abilities. Carotenoids also provide protection from cancer. One of the mechanisms of this is by increasing the expression of the protein connexin-43, thereby stimulating gap junctional communication and preventing unrestrained cell proliferation.

Pharmacodynamics

Lutein was found to be present in a concentrated area of the macula, a small area of the retina responsible for central vision. The hypothesis for the natural concentration is that lutein helps protect from oxidative stress and high-energy light. Several studies show that an increase in macula pigmentation decreases the risk for eye diseases such as Age-related Macular Degeneration (AMD).