Dose According to Form of Medicine
Introduction
In Ayurvedic Herbology, the therapeutic effect of a medicine depends not only upon the herb itself and the dosage administered but also upon the pharmaceutical form in which the medicine is prepared.
The same herb may produce different therapeutic effects when administered as:
- Swarasa (Fresh Juice)
- Kalka (Paste)
- Kwatha (Decoction)
- Hima (Cold Infusion)
- Phanta (Hot Infusion)
- Churna (Powder)
- Vati/Gutika (Tablet/Pill)
- Avaleha/Lehya (Linctus)
- Ghrita (Medicated Ghee)
- Taila (Medicated Oil)
- Asava-Arishta (Fermented Preparations)
This occurs because pharmaceutical processing alters:
- Potency
- Absorption
- Bioavailability
- Duration of action
- Tissue penetration
- Therapeutic focus
Therefore dosage must always be interpreted in relation to the dosage form being prescribed.
A physician who ignores the pharmaceutical form may either under-dose or over-dose a patient despite selecting the correct herb.
Importance of Dosage Form in Therapeutics
The dosage form determines how medicinal principles are extracted, preserved, absorbed, and delivered to the tissues.
Different dosage forms possess different strengths.
For example:
A few milliliters of Swarasa may possess greater potency than a much larger quantity of Phanta prepared from the same herb.
Thus dosage forms are not interchangeable.
Table 1: Influence of Dosage Form on Therapy
| Factor | Influence |
|---|---|
| Extraction Efficiency | Determines potency |
| Absorption | Determines effectiveness |
| Bioavailability | Determines utilization |
| Shelf Life | Determines stability |
| Palatability | Determines compliance |
| Tissue Penetration | Determines targeting |
| Duration of Action | Determines frequency |
Classical Hierarchy of Potency
Ayurveda generally considers fresh preparations more potent than extensively processed preparations.
Table 2: General Potency Hierarchy
| Dosage Form | Relative Potency |
|---|---|
| Swarasa | Very High |
| Kalka | High |
| Kwatha | Moderate to High |
| Hima | Moderate |
| Phanta | Mild to Moderate |
| Churna | Moderate |
| Vati | Moderate |
| Avaleha | Moderate |
| Ghrita | Deep Tissue Action |
| Taila | Specialized Action |
| Asava-Arishta | Sustained Action |
Swarasa (Fresh Herbal Juice)
Definition
Swarasa is the freshly expressed juice obtained directly from plant material.
It is regarded as one of the most potent forms of herbal administration.
Characteristics
- Maximum freshness
- High concentration
- Rapid action
- Minimal processing
Therapeutic Advantages
- Fast absorption
- Strong potency
- Direct therapeutic action
Dosage Considerations
Because of its potency, Swarasa often requires comparatively smaller quantities than many other preparations.
Table 3: Swarasa Characteristics
| Property | Clinical Importance |
|---|---|
| Freshness | Maximum potency |
| Rapid absorption | Quick action |
| Strong effect | Careful dosage required |
| Limited shelf life | Immediate use preferred |
Kalka (Herbal Paste)
Definition
Kalka is prepared by grinding fresh or dried herbs into a paste.
Characteristics
- Retains fiber
- Moderate to high potency
- Useful internally and externally
Dosage Considerations
Requires adjustment according to:
- Herb potency
- Method of administration
- Clinical objective
Table 4: Kalka Characteristics
| Property | Clinical Importance |
|---|---|
| Semi-solid | Sustained contact |
| Moderate absorption | Balanced action |
| Versatile use | Internal and external |
Kwatha (Decoction)
Definition
Kwatha is prepared by boiling herbs in water until reduced.
It is among the most widely used Ayurvedic dosage forms.
Characteristics
- Strong extraction
- Good bioavailability
- Versatile application
Advantages
- Effective extraction of water-soluble constituents
- Suitable for many diseases
- Easy preparation
Table 5: Kwatha Characteristics
| Property | Clinical Importance |
|---|---|
| Strong extraction | Good therapeutic effect |
| Water based | Easy assimilation |
| Moderate shelf life | Fresh preparation preferred |
Hima (Cold Infusion)
Definition
Hima is prepared by soaking herbs in cold water for an extended period.
Characteristics
- Cooling nature
- Mild extraction
- Suitable for Pitta disorders
Dosage Considerations
Often requires larger quantities compared with more concentrated preparations.
Table 6: Hima Characteristics
| Property | Clinical Importance |
|---|---|
| Cooling | Pitta management |
| Mild extraction | Gentler action |
| Easy tolerance | Useful in heat disorders |
Phanta (Hot Infusion)
Definition
Phanta is prepared by pouring hot water over herbs and allowing infusion.
Characteristics
- Mild extraction
- Easy digestion
- Useful for delicate herbs
Table 7: Phanta Characteristics
| Property | Clinical Importance |
|---|---|
| Gentle extraction | Mild action |
| Easy preparation | Convenient |
| Good compliance | Pleasant administration |
Churna (Powder)
Definition
Churna is a finely powdered herbal preparation.
Characteristics
- Versatile
- Stable
- Convenient
Advantages
- Easy storage
- Flexible dosage
- Suitable for many formulations
Table 8: Churna Characteristics
| Property | Clinical Importance |
|---|---|
| Powder form | Flexible administration |
| Stable | Good shelf life |
| Adjustable dose | Easy modification |
Vati / Gutika (Pills and Tablets)
Definition
Vati and Gutika are solid dosage forms prepared by combining powdered herbs with binding agents.
Characteristics
- Convenient
- Portable
- Precise dosing
Dosage Considerations
Often administered in standardized quantities.
Table 9: Vati Characteristics
| Property | Clinical Importance |
|---|---|
| Convenience | Improved compliance |
| Stability | Long shelf life |
| Precise dosing | Easy administration |
Avaleha / Lehya (Linctus)
Definition
Semi-solid preparations prepared with herbs, sweetening agents, and supportive substances.
Characteristics
- Nourishing
- Palatable
- Sustained action
Clinical Applications
Commonly used in:
- Respiratory disorders
- Debility
- Rasayana therapy
Table 10: Avaleha Characteristics
| Property | Clinical Importance |
|---|---|
| Palatable | Better compliance |
| Nourishing | Supports tissues |
| Sustained release | Longer action |
Ghrita (Medicated Ghee)
Definition
Medicinal preparations processed with clarified butter.
Importance
Ghrita possesses unique properties:
- Deep tissue penetration
- Nervous system affinity
- Rasayana potential
Dosage Considerations
Requires consideration of:
- Agni
- Meda status
- Digestive capacity
Table 11: Ghrita Characteristics
| Property | Clinical Importance |
|---|---|
| Lipid base | Enhanced delivery |
| Deep penetration | Reaches subtle tissues |
| Rasayana effect | Rejuvenation support |
Taila (Medicated Oils)
Definition
Herbal preparations processed in oil media.
Characteristics
- Vata pacifying
- Deep tissue penetration
- Internal and external use
Table 12: Taila Characteristics
| Property | Clinical Importance |
|---|---|
| Oleaginous | Vata management |
| Penetrating | Deep action |
| Versatile | Internal and external use |
Asava and Arishta
Definition
Naturally fermented herbal preparations.
Characteristics
- Self-generated alcohol content
- Improved extraction
- Long shelf life
Advantages
- Enhanced bioavailability
- Sustained therapeutic action
- Improved preservation
Table 13: Asava-Arishta Characteristics
| Property | Clinical Importance |
|---|---|
| Fermentation | Enhanced extraction |
| Long shelf life | Practical storage |
| Improved absorption | Greater bioavailability |
Ghrita versus Kwatha
A common clinical consideration involves choosing between Ghrita and Kwatha.
Table 14: Ghrita vs Kwatha
| Feature | Ghrita | Kwatha |
|---|---|---|
| Base | Lipid | Water |
| Tissue Penetration | Deep | Moderate |
| Nervous System Affinity | High | Moderate |
| Digestive Requirement | Higher | Moderate |
| Rasayana Potential | High | Moderate |
Churna versus Vati
Table 15: Churna vs Vati
| Feature | Churna | Vati |
|---|---|---|
| Flexibility | High | Moderate |
| Convenience | Moderate | High |
| Dosage Adjustment | Easy | Fixed |
| Compliance | Variable | Good |
Influence of Dosage Form on Frequency
Different forms require different administration schedules.
Table 16: Dosage Form and Frequency
| Dosage Form | Typical Frequency Trend |
|---|---|
| Swarasa | Short-term repeated |
| Kwatha | One to multiple times daily |
| Churna | Flexible |
| Vati | Regular intervals |
| Avaleha | Sustained administration |
| Ghrita | Individualized |
| Asava-Arishta | Usually regular intervals |
Dosage Modification According to Form
The physician should never assume that equal weights or volumes of different dosage forms are therapeutically equivalent.
Factors influencing adjustment include:
- Concentration
- Extraction efficiency
- Bioavailability
- Digestive requirements
- Tissue targeting
Table 17: Factors Requiring Dosage Modification
| Factor | Reason |
|---|---|
| Potency | Avoid over-treatment |
| Absorption | Improve effectiveness |
| Agni | Improve tolerance |
| Disease | Match therapeutic need |
| Patient Strength | Improve safety |
Clinical Example 1
Acute Digestive Disorder
Preferred Form:
- Kwatha
Reason:
- Rapid action
- Good extraction
- Easy administration
Clinical Example 2
Neurological Disorder
Preferred Form:
- Ghrita
Reason:
- Deep tissue penetration
- Nervous system affinity
Clinical Example 3
Long-Term Rasayana Therapy
Preferred Form:
- Avaleha
- Ghrita
Reason:
- Sustained nourishment
- Better compliance
Common Errors in Form-Based Dosing
Table 18: Clinical Mistakes
| Error | Consequence |
|---|---|
| Equal dosing across all forms | Incorrect potency |
| Ignoring Agni | Poor assimilation |
| Excess Ghrita in Mandagni | Digestive burden |
| Excess Swarasa | Overstimulation |
| Ignoring bioavailability | Poor outcomes |
Clinical Assessment Framework
Before selecting dosage, evaluate:
Table 19: Dosage Form Assessment
| Parameter |
|---|
| Disease Nature |
| Agni |
| Dosha |
| Dhatu Involvement |
| Srotas Involvement |
| Desired Speed of Action |
| Patient Preference |
| Compliance |
| Selected Dosage Form |
| Dosage Strategy |
Chapter Summary
The pharmaceutical form of a medicine significantly influences its therapeutic action.
Different dosage forms vary in:
- Potency
- Absorption
- Bioavailability
- Tissue penetration
- Duration of action
The physician must therefore adjust dosage according to the selected pharmaceutical form.
Successful prescribing requires understanding not only the herb but also the medium through which the herb is delivered.
Master Summary Table
Table 20: Dosage Forms and Therapeutic Characteristics
| Dosage Form | Primary Characteristic |
|---|---|
| Swarasa | Maximum potency |
| Kalka | Concentrated paste |
| Kwatha | Strong extraction |
| Hima | Cooling action |
| Phanta | Gentle action |
| Churna | Flexible dosing |
| Vati | Convenience |
| Avaleha | Nourishing action |
| Ghrita | Deep tissue delivery |
| Taila | Vata management |
| Asava-Arishta | Enhanced absorption |
Key Chapter Notes
- Pharmaceutical form influences therapeutic outcome.
- Different forms possess different potencies.
- Swarasa is among the most potent preparations.
- Kwatha remains one of the most widely used forms.
- Ghrita offers deep tissue penetration.
- Taila is particularly useful in Vata disorders.
- Asava-Arishta provide enhanced bioavailability.
- Dosage forms are not interchangeable.
- Agni influences tolerance of different forms.
- Dosage must be adjusted according to pharmaceutical preparation.
Classical References
- Charaka Samhita Sutrasthana
- Charaka Samhita Kalpasthana
- Sushruta Samhita Sutrasthana
- Ashtanga Hridaya Sutrasthana
- Sharangadhara Samhita Madhyama Khanda
- Bhavaprakasha
- Bhaishajya Ratnavali
- Rasatarangini