Symptoms of Drug Addiction

Drug addiction symptoms or behaviors include, among others: (from the Mayo Clinic)
* Feeling that you have to use the drug regularly — this can be daily or even several times a day
* Having intense urges for the drug
* Over time, needing more of the drug to get the same effect
* Making certain that you maintain a supply of the drug
* Spending money on the drug, even though you can’t afford it
* Not meeting obligations and work responsibilities, or cutting back on social or recreational activities because of drug use
* Doing things to get the drug that you normally wouldn’t do, such as stealing
* Driving or doing other risky activities when you’re under the influence of the drug
* Focusing more and more time and energy on getting and using the drug
* Failing in your attempts to stop using the drug
* Experiencing withdrawal symptoms when you attempt to stop taking the drug

ICD-10 Diagnostic guidelines
A definite diagnosis of dependence should usually be made only if three or more of the following have been present together at some time during the previous year:
* A strong desire or sense of compulsion to take the substance;
* Difficulties in controlling substance-taking behavior in terms of its onset, termination, or levels of use;
* A physiological withdrawal state when substance use has ceased or have been reduced, as evidenced by: the characteristic withdrawal syndrome for the substance; or use of the same (or closely related) substance with the intention of relieving or avoiding withdrawal symptoms;
* Evidence of tolerance, such that increased doses of the psychoactive substance are required in order to achieve effects originally produced by lower doses (clear examples of this are found in alcohol- and opiate-dependent individuals who may take daily doses sufficient to incapacitate or kill nontolerant users);
* Progressive neglect of alternative pleasures or interests because of psychoactive substance use, increased amount of time necessary to obtain or take the substance or to recover from its effects;
* Persisting with substance use despite clear evidence of overtly harmful consequences, such as harm to the liver through excessive drinking, depressive mood states consequent to periods of heavy substance use, or drug-related impairment of cognitive functioning; efforts should be made to determine that the user was actually, or could be expected to be, aware of the nature and extent of the harm.