Nature of Dependence and Withdrawal Syndrome
The development of pathological craving begins with the repeated use of substances capable of inducing euphoria—extremely pleasant subjective sensations. In susceptible individuals, the initial desire to simply repeat this experience transforms over time. The need shifts from controlled and desired to entirely irresistible.
A key concept in studying this phenomenon is withdrawal syndrome, or abstinence (derived from the Latin abstinentia, meaning "abstinence"). This state develops when the intake of the habitual substance into the human body ceases. Withdrawal syndrome is characterized by a severely debilitating clinical course, in which the patient suffers not only from psychological distress but also from pronounced somatic disorders, i.e., dysfunctions of various organs and systems. The fear of this distressing experience is frequently the primary motive for continuing drug use.
Classification of Types of Dependence
The classification of drug dependence into various types is based on the specific nature of symptoms upon complete cessation of substance use.
1. Psychological Dependence With this form, drug withdrawal does not cause severe physical (somatic) impairments. The clinical picture is restricted to the psychoemotional sphere: the patient experiences a sharp drop in mood, profound emotional discomfort, a sense of unmotivated fatigue, and severe depression. Typical agents that predominantly cause psychological craving:
- Psychostimulants (amphetamines, cocaine);
- Hallucinogens (e.g., LSD);
- Cannabis products (hashish, marijuana);
- Nicotine.
2. Physical Dependence This form has a significantly more severe clinical course, as emotional discomfort combines with a full-blown withdrawal syndrome. The clinical picture includes both subjective complaints and objective physiological abnormalities detectable upon physical examination. Typical substances that induce physical dependence:
- Opioids (heroin, morphine);
- Hypnotics and sedatives (benzodiazepines, barbiturates);
- Ethyl alcohol (alcohol).
Dynamics of Development and Terminology
Drug dependence almost always goes hand in hand with tolerance (habituation). This means that the body's sensitivity to the administered agent gradually decreases. To achieve the initial euphoric effect or simply relieve withdrawal, the patient requires a continuous and steady dose escalation. The maximum severity of the pathological process occurs when the individual simultaneously exhibits psychological dependence, physical dependence, and pronounced tolerance.
In medical and legal practice, it is important to distinguish between two related terms describing substance misuse:
- Substance abuse (toxicomania) is a broad, umbrella term. It refers to the use of any substances whatsoever for the purpose of achieving an intoxicating effect.
- Drug addiction (narcotic addiction) is a specific legal subset of substance abuse. Such a diagnosis is legally applicable only if the substance misused by the patient is officially listed in government schedules of controlled narcotic substances and subject to strict legal regulation.