What drugs do they use in lethal injections?!

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typically a barbiturate, paralytic, and potassium solution SOURCE: http://en.wikipedia.org/wiki/Lethal_inje…

The drugs are administered, in this order:

Anesthetic - Sodium thiopental, which has the trademark name Pentothal, puts the inmate into a deep sleep. This drug is a barbiturate that induces general anesthesia when administered intravenously. It can reach effective clinical concentrations in the brain within 30 seconds, according to an Amnesty International report. For surgical operations, patients are given a dose of 100 to 150 milligrams over a period of 10 to 15 seconds. For executions, as many as 5 grams (5,000 mg) of Pentothal may be administered. This in itself is a lethal dose. It's believed by some that after this anesthetic is delivered, the inmate doesn't feel anything.
Saline solution flushes the intravenous line.

Paralyzing agent - Pancuronium bromide, also known as Pavulon, is a muscle relaxant that is given in a dose that stops breathing by paralyzing the diaphragm and lungs. Conventionally, this drug takes effect in one to three minutes after being injected. In many states, this drug is given in doses of up to 100 milligrams, a much higher dose than is used in surgical operations -- usually 40 to 100 micrograms per one kilogram of body weight. Other chemicals that can be used as a paralyzing agent include tubocurarine chloride and succinylcholine chloride.
Saline solution flushes the intravenous line.

Toxic agent (not used by all states) - Potassium chloride is given at a lethal dose in order to interrupt the electrical signaling essential to heart functions. This induces cardiac arrest.
Within a minute or two after the last drug is administered, a physician or medical technician declares the inmate dead. The amount of time between when the prisoner leaves the holding cell and when he or she is declared dead may be just 30 minutes. Death usually occurs anywhere from five to 18 minutes after the execution order is given. After the execution, the body is placed in a body bag and taken to medical examiner, who may perform an autopsy. It is then either claimed by the inmate's family or interred by the state.

Imari Thomas had a very good answer (a thumbs up from me!), except things have changed in the past year.

All states & the federal government, with the exception of Ohio & Washington, use the three chemicals mentioned by Imari to carry out an execution. OH & WA have switched protocols to use a single dose of sodium thiopental alone for their executions.

However,
There is a shortage of sodium thiopental in the USA (no longer being manufactured in the US), and states have not been able to obtain new supplies for executions. Some states have imported from overseas (UK & India), while others are switching to a derivative of phenobarbital. Oklahoma has already executed two with phenobarbital (along with the other two chemicals) instead of sodium thiopental. Ohio used their last dose of sodium thiopental this past week with the execution of Frank Spisak, and will be switching to a single does of phenobarbital to execute Johnnie Bastion on 10-MAR-2011.

One final note, Ohio also has a protocol in place to use an intramuscular injection of a derivative of morphine. This protocol has not yet been used and is in place in cases where a suitable vein cannot be located on the condemned (due to past IV drug use, overweight, etc).

Generally a barbiturate, a paralytic agent and potassium solution which effectively stops the heart quickly.

this is terrible i am so agianst injection uggg

kind of wierd that you want to know that.