Medicinal preparations can be made in the form of powders diluted with cane sugar, milk sugar, starch, acacia, tragacanth, marshmallow root, or other inert powders. Triturations are potent remedies mixed with nine times their weight of milk sugar. Confections and electuaries are soft solid mixtures made by combining powders or extracts with syrup or honey. Masses refer to a consistency that allows for the formation of pills and troches. Troches or lozenges, weighing from two to thirty grains, contain sugar or extract of licorice to improve taste. Pills, usually spherical or oval, weigh between one grain and five grains and are made by mixing medicinal agents with excipients like powdered slippery elm bark, tragacanth, glycerin, glucose syrup, and mucilage of tragacanth. Cataplasms include flaxseed poultices and mustard plasters, prepared using cold water followed by boiling water for flaxseed or tepid water for mustard. Ointments are made from fatty substances like lard, lanolin, petrolatum, glycerite of starch, and contain medicinal agents in a semi-fluid state. Cerates have higher melting points than ointments and are used as dressings. Plasters consist of metallic oleates, resins, gum-resins, wax, and soap, with solid extracts rendered semi-fluid before incorporation. Suppositories made from cocoa butter are intended for local medication.
<Callout type="important" title="Excipient Selection">Choosing the right excipients is crucial in pill-making to ensure that pills are neither too hard nor too soft.</Callout>
<Callout type="risk" title="Boiling Water Hazard">Avoid using boiling water when preparing mustard plasters as it can coagulate a constituent of the mustard and cause loss of volatile oil, reducing effectiveness.</Callout>
Key Takeaways
- Understand the importance of excipient selection in pill-making.
- Learn how to prepare flaxseed poultices and mustard plasters correctly.
- Recognize the difference between ointments, cerates, and plasters.
Practical Tips
- Use powdered slippery elm bark for stiffening soft pill masses.
- Add glycerin to prevent pills from becoming too hard after drying.
- Ensure that medicinal agents are in a semi-fluid state before mixing with fatty bases.
Warnings & Risks
- Avoid using boiling water when preparing mustard plasters as it can reduce their effectiveness.
- Do not use rancid lard or fat for ointments, as they may cause inflammation rather than soothe the skin.
Modern Application
While many of these traditional preparation methods are no longer commonly used in modern medicine due to advancements in pharmaceutical technology and regulation, understanding them can provide valuable insights into basic principles of drug formulation. Knowledge of excipient selection, for instance, remains crucial even today.
Frequently Asked Questions
Q: What is the purpose of using milk sugar in medicinal preparations?
Milk sugar is used to dilute potent substances or to give bulk to pill masses without stiffening them.
Q: Why should glycerin be added when making pills?
Glycerin helps prevent the pills from becoming too hard after drying, ensuring they remain soft and easily disintegrable in the stomach.
Q: What is a cataplasm and how is it prepared?
A cataplasm, such as a flaxseed poultice or mustard plaster, is an external application made by mixing ground flaxseed with cold water followed by boiling water to form the right consistency.