Okay, so I decided to do the research because I was getting very curious myself...
Oxycodone: Is in a group of drugs called narcotic pain relievers. It is similar to morphine. It is used to treat moderate to severe pain. It may be habit forming and should only be taken by the person to whom it was prescribed. Dangerous side-effects or death can occur when alcohol is combined with a narcotic pain medicine. An overdose of Oxycodone can be fatal. Overdose symptoms may include extreme drowsiness, muscle weakness, confusion, cold and clammy skin, pinpoint pupils, shallow breathing, slow heart rate, fainting, or coma.
Hydrocodone: Is habit forming. It is possible become physically and/or psychologically dependent on the medication. Withdrawal effects may occur if hydrocodone and acetaminophen is stopped suddenly after several weeks of continuous use. Your doctor may recommend a gradual reduction in dose. Avoid alcohol while taking hydrocodone and acetaminophen . Alcohol can increase drowsiness and dizziness caused by the medication, possibly resulting in unconsciousness and death. Hydrocodone and acetaminophen may increase the effects of other drugs that cause drowsiness, including antidepressants, alcohol, antihistamines, pain relievers, anxiety medicines, seizure medicines, and muscle relaxants. Dangerous sedation, dizziness, or drowsiness may occur if hydrocodone and acetaminophen is taken with any of these medications. Symptoms of an hydrocodone and acetaminophen overdose may include slow breathing, seizures, dizziness, weakness, loss of consciousness, coma, confusion, tiredness, cold and clammy skin, small pupils, nausea, vomiting, and sweating.
Diazepam: Avoid alcohol while taking diazepam. Alcohol may increase drowsiness and dizziness caused by diazepam. Alcohol may also increase the risk of having a seizure if diazepam is being taken for a seizure condition. Diazepam is habit forming. You can become physically and psychologically dependent on the medication. Diazepam is in a class of drugs called benzodiazepines. Diazepam affects chemicals in the brain that may become unbalanced and cause anxiety, seizures, and muscle spasms. Diazepam is used to relieve anxiety, nervousness, and tension associated with anxiety disorders. It is also used to treat certain types of seizure disorders and muscle spasms. Symptoms of a diazepam overdose include sleepiness, dizziness, confusion, a slow heart beat, difficulty breathing, difficulty walking and talking, an appearance of being drunk, and unconsciousness.
Temazepam: Temazepam affects chemicals in the brain that may become unbalanced and cause sleep problems (insomnia). Temazepam is used to treat insomnia symptoms, such as trouble falling or staying asleep. Do not drink alcohol while taking temazepam. It can increase some of the side effects, and could possibly cause a fatal overdose. Temazepam may be habit forming. An overdose of temazepam can be fatal, especially if taken with alcohol. Symptoms of a temazepam overdose may include extreme drowsiness, confusion, muscle weakness, slurred speech, tremors, a slow heartbeat, shallow breathing, feeling light-headed, fainting, seizure (black-out or convulsions), or coma.
Alprazolam: Do not drink alcohol while taking alprazolam. This medication can increase the effects of alcohol. Avoid using other medicines that make you sleepy. They can add to sleepiness caused by alprazolam. Alprazolam may be habit forming. Samples of alprazolam purchased on the Internet have been found to contain haloperidol (Haldol), a potent antipsychotic drug with dangerous side effects. Alprazolam is used to treat anxiety disorders, panic disorders, and anxiety caused by depression. An overdose can be fatal. Symptoms of an alprazolam overdose may include extreme drowsiness, confusion, muscle weakness, loss of balance or coordination, feeling light-headed, fainting, or coma.
Doxylamine: Is used for treating occasional sleeplessness and reducing difficulty falling asleep. Doxylamine is an antihistamine. It works by depressing the central nervous system (brain) to produce drowsiness. May cause drowziness or dizziness. Avoid drinking alcohol or taking other medications that cause drowsiness (eg, sedatives, tranquilizers) while taking this medicine. Doxylamine will add to the effects of alcohol and other depressants. Alcohol, hot weather, exercise, and fever can increase the risk of dizziness, lightheadedness, or fainting. Do not become overheated in hot weather or during exercise or other activities because heatstroke may occur. If sleeplessness persists for more than 2 weeks, contact your health care provider. Common side-effects: Dizziness; drowsiness; dry mouth, throat, and nose; thickening of mucus in nose or throat. Severe side-effects: Severe allergic reactions (rash; hives; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); convulsions; decreased alertness; excitability; fast heartbeat; hallucinations; tightness or pounding in the chest; tremor; wheezing.
All I could think about was all the possibilities of what exactly killed Ledger. I thought of him while looking this up. It really, really bothered me.