Classification of Tablets with Their Types & Uses

In the pharmaceutical industry, tablets are one of the most widely used solid dosage forms. They are prepared by mixing powders or granules containing Active Pharmaceutical Ingredients (APIs) with various excipients and then compressing the mixture. Tablets are highly preferred because they offer precise dosing, excellent stability, ease of administration, and cost-effective manufacturing.

In pharmaceutics, tablets are classified based on their route of administration, formulation characteristics, and drug release properties. Various types of tablets are developed to enhance patient convenience, improve drug absorption, and ensure the controlled delivery of medication. Understanding the classification of tablets is essential for pharmacy students and professionals working in the fields of pharmaceutical formulation and drug development.

1. Tablets Intended for Swallowing Whole : These tablets are designed to be swallowed whole with water and represent the most common type of medication used in medical treatment.

Compressed Tablets

Compressed tablets are the most basic and widely used type of tablet. They are manufactured by compressing granular powder using a tablet compression machine.

Uses:
• Used for common medications, such as painkillers, antibiotics, and vitamins.
• Provide precise dosage accuracy and ease of administration.

Coated Tablets

Coated tablets feature a special coating layer applied to their surface. This coating may be sugar-based, film-based, or polymer-based.

Uses:
• Mask the unpleasant taste and odor of medications.
• Protect the medication from moisture, light, or air.
• Improve the texture and stability of the tablet.

Enteric-Coated Tablets

Enteric-coated tablets are designed with a protective coating that prevents them from dissolving in the acidic environment of the stomach, allowing the tablet to dissolve instead in the intestine.

Uses:
• Protect medications that are unstable in stomach acid.
• Reduce gastric irritation caused by certain medications, such as aspirin.

Sustained-Release Tablets

Sustained-release tablets are formulated to release the medication gradually over an extended period.

Uses:
• Maintain a consistent level of the medication in the bloodstream.
• Reduce the frequency of dosing and improve patient adherence to the medication regimen.

2. Tablets Used in the Oral Cavity : These tablets are designed in such a way that, rather than being swallowed immediately, they dissolve, disintegrate, or begin to take effect while still inside the mouth.

Chewable Tablets

Chewable tablets are chewed before being swallowed. Flavoring agents and sweeteners are typically added to them to enhance their taste.

Uses:
• Commonly used for vitamins, antacids, and pediatric medications.
• Suitable for patients who experience difficulty swallowing tablets.

Sublingual Tablets

Sublingual tablets are placed under the tongue, where they dissolve rapidly and are absorbed directly into the bloodstream through the oral mucosa (the inner lining of the mouth).

Uses:
• Begin to take effect very quickly.
• Used for medications where an immediate onset of action is required.

Buccal Tablets

Buccal tablets are placed between the gum and the cheek. The medication is gradually absorbed into the body through the mucous membrane of the cheek.

Uses:
• Release the medication slowly over an extended period.
• Bypass the ‘first-pass metabolism’ that occurs in the liver.

Lozenges (Troches)

Lozenges are tablets that dissolve slowly in the mouth, thereby releasing the medication gradually.

Uses:
• Treat throat infections, coughs, and oral irritation.
• Exert a direct, localized effect within the oral cavity.

3. Tablets Used to Prepare Solutions : These tablets are designed to dissolve or disperse in water before being taken.

Effervescent Tablets

Effervescent tablets contain a mixture of citric acid and sodium bicarbonate, which react in water to produce carbon dioxide, causing the tablet to dissolve rapidly.

Uses:
• Ensure rapid absorption of the medication.
• Improve the taste and make it easier for patients to take the medication.

Soluble Tablets

Soluble tablets dissolve completely in water to form a clear solution.

Uses:
• Suitable for patients who have difficulty swallowing tablets.
• Result in a faster onset of the medication’s effect.

Dispersible Tablets

Dispersible tablets break down in water to form a uniform suspension.

Uses:
• Typically used in pediatric medications.
• Make it easier for children and elderly patients to take the medication.

Tablets offer many advantages compared with other dosage forms.
• Provide accurate and precise dosage of medication.
• Convenient to carry, store, and administer.
• Good chemical and physical stability.
• Easy large-scale manufacturing in pharmaceutical industries.
• Cost-effective compared with many other dosage forms.

Because of these advantages, tablets are considered the most widely used pharmaceutical dosage form worldwide.

Despite their advantages, tablets also have some limitations.
• Some patients, especially children and elderly people, may find them difficult to swallow.
• Not suitable for drugs that cause gastric irritation.
• Drugs with poor compressibility may be difficult to formulate into tablets.
• Tablets generally have a slower onset of action compared with injections.

Tablets play a vital role in modern pharmaceutics due to their convenience, stability, and precise drug delivery. They are classified into different types based on their method of administration and formulation characteristics, such as tablets swallowed whole, tablets used in the oral cavity, and tablets used to prepare solutions. Each type of tablet is designed to meet specific therapeutic needs and improve patient compliance. Understanding the classification of tablets is essential for pharmacy students and professionals involved in pharmaceutical formulation and drug delivery systems.