What Is A Lethal Dose Of Seconal (Secobarbital)?

Seconal, also known by its generic name secobarbital, is a powerful sedative medication from a class of drugs called barbiturates. Doctors prescribe Seconal to treat severe insomnia or to sedate patients before surgery, but it’s rarely used today because safer alternatives are now available. When prescribed, Seconal comes in 100-milligram tablets, and the typical recommended dose ranges from 100 to 300 milligrams per day. However, the line between a therapeutic dose and a dangerous one is alarmingly narrow with this medication, which is why Seconal carries such serious risks.

The lethal dose of Seconal, the amount that can kill someone, ranges from 2,000 to 10,000 milligrams, depending on factors like a person’s body weight, tolerance to the drug, and whether they’ve mixed it with other substances. Even more concerning is that toxic effects can begin at doses as low as 1,000 milligrams, which is only three to ten times higher than a prescribed daily dose. This means taking just a handful of extra pills beyond what’s prescribed can lead to life-threatening complications. When Seconal is combined with alcohol or other depressant drugs like opioids or benzodiazepines, the risk of overdose increases dramatically.

Learn more about the lethal dose of commonly abused drugs

Factors That Can Affect The Lethal Dose Of Seconal

Seconal can be toxic in very high doses when taken alone, or with other drugs. Taking high doses of Seconal with other depressants can be dangerous and is a known risk factor for overdose.

Common depressant drugs include:

• other barbiturates
• benzodiazepines (e.g. Xanax, Klonopin)
• alcohol
• opioids (e.g. heroin, Vicodin)

Children and elderly adults can be at risk for overdose in smaller doses than the average person. Additional risk factors include impaired liver or kidney function and low body weight.

What Are The Signs Of Seconal Overdose?

Knowing the signs of Seconal overdose can be life-saving. Signs of overdose can occur within 15 minutes of use. If someone is showing signs of overdose, seek medical attention.

Signs and symptoms of Seconal overdose include:

• slowed breathing
• no breathing
• low body temperature
• low blood pressure
• blisters
• nausea
• coma

Without treatment, complications of Seconal overdose can include kidney failure, congestive heart failure, cardiac arrhythmias, pulmonary edema, and death.

Can Seconal Abuse Increase Your Risk Of Fatal Overdose?

Seconal is highly addictive, especially when taken regularly over time or used in ways other than exactly as prescribed by a doctor. People who abuse Seconal by taking higher doses, taking it more frequently than directed, or using it to get high rather than for legitimate medical reasons are putting themselves at serious risk. As tolerance builds with continued abuse, someone needs increasingly larger doses to achieve the same sedative effects. This dangerous pattern increases the likelihood of overdose, as the person may take what they think is their “usual” amount without realizing they’ve crossed into lethal territory.

Seconal overdose is often a clear warning sign of drug abuse and addiction. The more frequently someone abuses this medication, the higher their risk becomes of taking a fatal dose. Each time someone misuses Seconal, they’re gambling with their life, as even a slight miscalculation in dosage can lead to respiratory depression, coma, or death. If someone has survived a Seconal overdose, it’s critical that they receive substance abuse treatment.

Why Seconal Is Rarely Prescribed Today

Seconal was widely prescribed throughout the mid-twentieth century as a sleep aid and pre-surgical sedative, but its use has declined sharply over the past few decades for good reason. The margin between a therapeutic dose and a fatal one is dangerously small compared to newer medications, and the risk of dependence develops quickly even when the drug is taken exactly as directed. Benzodiazepines and other sedative medications have largely replaced barbiturates like Seconal in clinical practice because they are considered safer for long-term management of insomnia and anxiety.

Today, a prescription for Seconal is relatively uncommon and typically reserved for very specific clinical situations where other options have failed. When it does appear outside of a legitimate medical context, it’s almost always being misused.

Treatment For Seconal Addiction

Seconal overdose is a life-threatening condition that can indicate a drug problem or an underlying mental health condition. Without treatment, this can be fatal. For more information about addiction treatment options for yourself or a loved one, contact the Substance Abuse and Mental Health Services Administration (SAMHSA) or browse our directory.

Written by the Addiction Resource Editorial Staff