1. Critical illnesses are often associated with circulatory, respiratory, hepatic and/or renal dys­function that may alter the pharmacokinetics and/or pharmacodynamics of drugs.
2. Decisions about routes of administration and doses of drugs used during medical emergen­cies must consider the physiological status of the patient, the pharmacokinetic and pharmacodynamic characteristics of the particular drug, and how the two interact.
3. Adverse drug reactions and interactions are more likely in critically ill patients due to the effect of the disease on drug kinetics, the decreased toxic-therapeutic ratio due to severe under­lying illness, and the large number of medications that such patients receive. Adverse reactions to drugs should be considered when unexplained deterioration or failure to respond to therapy are encountered.
4. Preservation of function of vital organs is a fundamental concept of critical care therapeutics. Preservation of cardiovascular functions requires attention to fluid and electrolyte status, prompt correction of arrhythmias and shock, and measures to preserve the myocardium against ischaemic injury.
5. Preservation of respiratory function requires protection of the airway, cautious use of fluids and oxygen, and prompt recognition and management of infection.
6. Preservation of cerebral function requires maintaining cerebral blood flow with adequate oxygen and glucose sufficient to meet the metabolic demands of the brain. This entails main­taining adequate systemic circulation, control of intracranial hypertension, and prompt control of seizures and hyperthermia.



7. Critically ill patients are particularly susceptible to infections, gastric stress erosions and ulcers, adult respiratory distress syndrome, pulmonary emboli, and haemostatic disorders. The risks of such complications may be reduced by meticulous care of catheters, pulmonary toilet, cautious use of fluids, prompt treatment of infection when it occurs, and selective prophylactic drug therapies.
8. Shock can be produced by many different processes including myocardial infarction, hypovolaemia, sepsis, drug overdose, burns, hypothermia, spinal cord transsection and anaphylaxis. Optimum treatment of shock depends on knowledge of the pathophysiology of the shock state and the pharmacology of the drugs.
9. Features of acute drug intoxication include coma, agitated delirium, seizures, hypo- and hyperthermia, shock, arrhythmias, aspiration and pulmonary oedema. Successful therapy of acute drug intoxication depends on the integration and application of knowledge of the pharmacology of both the intoxicating drug and the drugs used in therapy, as well as the principles of supportive critical care.

• Nausea and vomiting associated with cancer chemotherapy,
• appetite stimulation and weight-loss prevention in people with acquired immunodeficiency syndrome (AIDS).

General Information

• Dronabinol is a legal form of marijuana. The psychoactive chemical in marijuana is delta-9-THC. Dronabinol has all of the psychological effects of marijuana and is therefore considered to be a highly abusable drug.
• Dronabinol increases the effects of alcohol, sleeping pills, sedatives, and other depressants.
• Dronabinol also enhances the effects of psychoactive drugs including tricyclic antidepressants, amphetamines, cocaine, and other stimulants.
• This drug is known to be potential cause of personality changes, feelings of detachment, hallucinations, and euphoria (feeling “high”).
• Younger adults have reported a greater success rate with dronabinol, probably because they are better able to tolerate these effects.
• Most people start taking dronabinol while in the hospital so their response to the drug and its possible adverse effects can be monitored.
• Dronabinol has also been studied as a glaucoma treatment. ( More information to be researched in this field )
• Dronabinol may increase the effects of fluoxetine and disulfiram.
• The effects of theophylline drugs are reduced by dronabinol.
• Combining dronabinol and antihistamines or anticholinergic drugs may cause either rapid heartbeat or excessive drowsiness.

Cautions ( This drug has serious effects ! )

• Do not take dronabinol if you are allergic or sensitive to any of its ingredients, to marijuana. or to sesame oil.
• Dronabinol should be used with caution in those with a history of seizure disorders or substance abuse.
• Dronabinol should be used with caution by people with heart disease or high blood pressure.
• Dronabinol has a profound effect on mental states, as it will impair your ability to operate complex equipment or engage in any activity that requires intense concentration, sound judgment, or coordination—such as driving a car.
• Dronabinol should not be used to treat nausea and vomiting caused by anything other than cancer chemotherapy.
• Dronabinol produces withdrawal symptoms when the drug is stopped. These may develop within 12 hours of the drug’s discontinuation and include restlessness, sleeplessness, and irritability.
• Within a day after the drug has been stopped, symptoms like stuffy nose, hot flashes, sweating, loose stools, hiccups, or appetite loss may occur. These symptoms usually subside within a few days.
• Dronabinol should be used with caution by people with a manic-depressive or schizophrenic history because it may aggravate the underlying disease.

Note :-

• Avoid alcohol and other central nervous system (CNS) depressants.
• The capsules must be stored in the refrigerator.
• Be careful when driving or performing any task that requires concentration.
  Dronabinol may cause acute psychiatric or psychological side effects. Call your doctor for advise.

Common Side Effects of the drug :-

• drowsiness,
• depression,
• loss of muscle coordination,
• unsteadiness,
• paranoia,
• depersonalization,
• disorientation,
• euphoria,
• dizziness,
• weakness,
• sluggishness,
• nausea and vomiting,
• headache,
• a separation in time and space,
• confusion,
• rapid heartbeat.
• hallucinations,
• memory lapses,
• anxiety,
• muddled thinking,
• perceptual difficulties,
• poor coordination,
• irritability,
• dizziness when rising from a sitting or lying position.

Unlikely Side Effects :-

• difficulty talking or slurred speech,
• facial flushing
• loss of bowel control,
• excessive perspiration,
• fainting,
• diarrhea,
• nightmares,
• ringing or buzzing in the ears,
• muscle pain

Usual Dose Intake ( Do not take a double dose )

1. Antiemetic :

• 5 mg 1-3 hours before starting chemotherapy treatment and repeated every 2-4 hours after treatment, for a total of 4-6 doses a day.
• Dosage may be increased up to 15 mg per dose if needed; psychiatric side effects increase greatly at higher dosages.

2. Appetite Stimulant:

• 2.5 mg before lunch or dinner, or 2.5 mg at bedtime. Dosage may be increased to 20 mg a day.

Over Dosage Effect(s)

• Overdose symptoms may occur at usual dosages or at higher dosages if the drug is being abused.
• The primary symptoms of overdose are the psychological symptoms listed above (see “Side Effects lists above”).
• In some cases, overdose may lead to panic reactions or seizure.

Pregnancy/Breast-feeding period :

• Dronabinol is known to be passes into breast milk. Nursing mothers who must take this drug should use infant formula. Animal laboratory studies have shown adverse effects on the fetus.