Routes of Drug Administration


Introduction: Course of government is an equally important element which affects the absorption of a drug. The interval between administration and beginning of actions is dependent on the path of government. Biological lag is that the period between government of a drug and evolution of reaction.

Classification of paths: The routes of medication management can be viewed as:”

Cosmetic or enteral path: This is most commonly used path for drug administration Canadian Pharmacy.

Advantages of oral path:

1. It is actually a secure, convenient and inexpensive path.

2. Self medication is possible.

3. Withdrawal of this drug is potential.

Cons of dental path:

Inch. On set of drug action is slow.

2. Drugs that are bitter in flavor may not be treated.

3. Drugs producing nausea and sickness may not be treated.

4. The medication might be modulated by gastric enzymes.

5. This path is not potential in a unconscious patient.

Enteric-coated tablets and pills: These are oral preparations coated using cellulose acetate or glutenfree. These coatings can’t be destroyed from the acid juice of the stomach. Simply the alkaline intestinal juice eliminates those coatings. Thus inactivation of the medication in the stomach is also prevented. Thus an desirable focus of the medication is discharged in the gut.

Sustained release or time discharge preparations (Spansules): All these are oral preparations containing a variety of coatings. Each coating succeeds at distinct time periods releasing the active drug. Hence that the drug is released slowed for extended intervals.

Parenteral paths: Routes of government besides oral (enteral) route are termed as parenteral.

Advantages of parenteral path:

Inch. Absorption is rapid and rapid.

2. Correct dose of this medication may be contributed.

3. The drug enters in to flow at an active sort.

4. It is useful in emergency.

5. It’s helpful in the event of an unconscious individual.

Cons of parenteral route:

1. Anxiety may be made by way of injection.

2. Abscess processes are necessary for injection.

3. Sterile processes are necessary for injection.

4. It is a pricey route.

5. Selfmedication is not doable.

a. Injection

1. Intradermal: This medication is injected at the layers of skin e.g. B.C.G vaccine.

2. Subcutaneous: Non-irritant substance independently can be injected by this route. The speed of absorption is both even and slow and hence the result is prolonged.

3. Intramuscular: This medication is injected deep into muscle tissue. The pace of absorption will be uniform and beginning of action is quickly.

4. Intra-Venous: A drug is injected into a pit.


(I) The drug enters in to circulation at a busy kind.

(ii) wanted blood concentration could be obtained.

(iii) Fast and instantaneous effect is made.

(iv) It’s of good use in the event of emergency.

(v) It is useful in a subconscious patient.


(I) Drugs that precipitate blood constituents cannot be handled.

(ii) Untoward reactions, in case take place are immediate.

(iii) Withdrawal of this drug isn’t doable.

5. Intra-arterial: In such a route, a drug is injected directly into an artery. The effect of a drug may be localized in a particular organ or tissue by simply deciding upon the proper artery. Anticancer medications are sometimes handled via this route.

6. Intraperitoneal: In such a route, a drug is injected in to the peritoneal cavity. By doing this, liquid like glucose and saline may be contributed to kids.

7. Bone – marrow: bone-marrow shot is quite similar to intravenous injection. This route is useful when veins aren’t available due to coronary artery or thrombosis. In older people, the sternum is preferred and also in kids, tibia or femur is chosen for injection.

B. Inhalation: Gases, volatile liquids, aerosols or vapours may be treated by this route.


1. Immediate absorption of the medication.

2. Localization of the result of illnesses of the respiratory tract.


1. Inadequate power to modulate this dose.

2. Local discomfort of the respiratory tract may improve its secretions.

3. Difficulty at the method of management.

C. Transacutaneous course: It is further classified as

I) Iontophoresis

ii) Inunctions

iii) Jet injection

Iv) Glue components.

I) Iontophoresis: During this technique, a drug is driven deep into your skin with the galvanic existing e.g. salicylates. Anode iontophoresis is used for positively charged drugs and cathode iontophoresis is utilize for negatively charged compounds.

Ii) Inunction: It is rubbing against the medication onto the skin. The medication gets absorbed and delivers systemic influence e.g. nitroglycerine ointment for angina.

Iii) Jet shot: This procedure doesn’t need a springup. So it’s painless. Using a gun such as tool with a micro-fine orifice, the drug option is projected as a higher velocity jet (dermojet). The medication solution goes through shallow levels of skin and gets deposited in the adrenal tissues. This system is beneficial for bulk inoculation.

I V ) Adhesive units: It is a trans dermal medication shipping system. It is available in the shape of glue unit. It supplies the medication gradually. So it produces lengthy systemic impact. E.g. scopolamine for motion sickness.

D. Transmucosal route: It is additionally categorized as

A) Sub-lingual

B) Trans-nasal

Do ) Trans-rectal.

A) sublingual path: A pill containing the drug is put below the tongue and allowed to dissolve in the mouth e.g. nitro-glycerine along with isoprenaline.

Benefits of Sublingual course:

1. Rapid start of action.

2. Termination of the effect by spitting the tablet.

3. Inactivation of the drug from the stomach is avoided.

4. The drug enters into systemic flow without any inactivation from the liver.

B) Trans-nasal path: It is helpful for medication in the type of snuff or nasal spray. The medication is easily absorbed via the mucous membranes of nose. E.g. lateral powder.

Do ) Trans-rectal path: Drugs could be consumed via the anus for creating systemic outcomes. E.g. aminophylline to get bronchospasm, diazepam for status epileptic-us. Benefits of rectal route would be:

1. Allergic irritation is also prevented.

2. It is useful in older and terminally ill people.

E. New drug delivery approaches:

I) Occusert: It is positioned directly beneath the cheek. It might release drugs such as pilocarpine for prolonged periods.

Progestasert ) Progestasert: It is a intrauterine contraceptive product. It creates managed discharge of progesterone inside the uterus to get per calendar year.

Iii ) Pro-drug: It is an inactive drug which right after government is metabolized to an active medication. As an example, I-dopa can be an inactive chemical. After administration, it’s metabolized to the active drug dopamine which is effective in Parkinson.

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