Intro Flashcards
what is phytotherapy?
the medical discipline that uses
plants either to treat disease or as health- promoting
agents.
what is rational phytotherapy?
science-based, empirical
approach to the use of medicinal plants in the treatment
and prevention of diseases.It allows the correct use of medicinal plants, in relation to
the pharmacological properties of their chemical
constituents.
what is a herb?
crude plant materials such as wood, flowers, leaves,
..etc or other plant parts, which may be entire, fragmented
or powdered.
what is herbal material?
include, in addition to herbs, fresh
juices, gums, fixed oils, essential oils, resins and dry
powders of herbs.
what are herbal preparations?
are the basis for finished herbal
products and may include powdered herbal materials, or
extracts, tinctures and fatty oils of herbal materials.
what are finished herbal products?
consist of one or more herbal
preparations made from one or more herbs.
▪ Finished herbal products and mixture herbal products may
contain excipients in addition to the active ingredients.
what is CAM
Complementary and alternative medicine(CAM): is a
group of diverse medical and health care systems, practices
and products that are not presently considered to be part of
conventional medicine.
Complementary medicine: used together with
conventional medicine, which is also called allopathy or
biomedicine.
▪ Alternative medicine: is used place of conventional
medicine.
what does CAM include?
- Whole medical systems (e.g. acupuncture, homeopathy).
- Mind-body medicine (i.e. meditative, and relaxation
techniques). - Biologically-based systems (e.g. natural products).
- Manipulative and body-based practices (e.g. massage,
chiropractics). - Energy medicine (e.g. Reiki therapy).
why did the use of cam increase?
- Expected benefits and perceived safety of CAM.
- Availability and accessibility of CAM.
- Influence from friends, family, and the mass media.
- Dissatisfaction with conventional medicine.
- The high prevalence of chronic diseases.
- Cost.
- Adverse effects of conventional medicine.
what is the synergy effect
Synergy is an effect seen by a combination of
substances that is greater than would have been
expected from a consideration of individual contribution.
▪ If synergy is present the dose of the combination needed
to produce the same effect will be less than that for the
individual components.
▪ Example: the use of cannabis in multiple sclerosis to
control muscle spasticity and chronic pain.
▪ Mechanism of synergy?
I. Pharmacokinetic or physicochemical effects based on
improved solubility, resorption rate and enhanced
bioavailability.
II. Pharmacodynamic effects: multitarget effects.
what is the polyvalent action
▪ Or multifactorial effects:
▪ Several compounds affecting a single target, either
directly or indirectly.
▪ A single compound affecting multiple targets.
▪ Multiple compounds affecting multiple related
targets.
what is the unstable action ?
Sometimes the presence of all of the components
isolated from the plant material, which may
include antioxidants for example, may ‘protect’ the
actives from decomposition.
▪ Example: valerian (Valeriana spp.), and garlic.
what are the unknown active constituents?
For some herbs, even those that are widely used,
the actives may not have been completely
identified.
▪ Example: passion flower.
▪ It is unusual for a plant to contain only one active
constituent.
▪ Example: cannabis.
adverse effects in phytomedicine
▪ Natural is not equal to safe.
▪ Herbs can have undesirable side effects just as
conventional drugs do. Also, adverse effects are
attributable to factors such as excessive dosing,
allergic reactions, some herbal ingredients are
intrinsically toxic, and interacts with prescription
drugs.
what are some quality problems with herbs
▪ Misidentified plant species.
▪ Contamination with heavy metals.
▪ Adulteration with prescription drugs.