Meth effects

Learn how meth can affect every part of the human body and the consequences of meth abuse on your health. More here.

minute read

The effects of meth are dangerous!

Methamphetamine is a highly addictive central nervous stimulant that affects the brain and body. Because of its high potential for abuse, methamphetamine is classified as Schedule II drug. In fact, meth is considered one of the most dangerous drugs people take, with a potential for developing severe psychological or physical dependence, and addiction.

What are the specific effects of meth use and abuse on every part of the human body? We answer here! If you want to ask anything about meth effects, please post your questions in the comments section below. We try to respond personally to all legitimate questions.

Meth effects on the body

Meth has dangerous and harming effects on almost every organ in the body. It harms the heart and lungs, increases heart rate, leads to irregular heartbeat, increases blood pressure. Meth use can cause irreversible damage to small blood vessels in the brain which may lead to strokes.

Meth users lose their appetite, so over time they lose a lot of weight and become very skinny. Meth also destroys enamel, causing dental problems.

The hallucinogenic effects of meth makes the user to see imaginary insects that they come to believe are crawling all over them. Scratching and picking at these imaginary bugs causes sores on the skin. Note also that meth addicts age very quickly, become extremely thin, have pale complexions and a generally unhealthy appearance.

Meth effects on the brain and nervous system

Meth is a stimulant, so the use of meth cases a ‘high’ that can last up to 12 hours. Users get attached to this drug because of the intensive highs. However, when meth’s effects of euphoria and pleasure wear off, the brain is left deprived of dopamine, and users experience:

  • depression
  • exhaustion
  • loss of energy
  • lack of focus
  • sleepiness

Long term use of this drug has damaging effects on the brain. It’s actually known to cause more damage to the brain than heroin or cocaine. Meth destroys the brain cells that contain dopamine and serotonin. Over time, users have an increased risk of Parkinson’s disease. How does meth work, exactly?

Specifically, methamphetamine works by causing a release of two neurotransmitters in the brain: dopamine and serotonin. The brain communicates with every organ of your body signalling it to function regularly via neurotransmitters. In fact, neurotransmitters have a significant influence over your mood, sleep, body weight and focus.

Meth effects on the mind

Meth abuse causes permanent damages to the brain, weakening the abilities to memorize, reason, and feel normal pleasures. The psychotic symptoms caused by the use of this drug can last for several years, even after the person has stopped using methamphetamine. The significant changes of meth use and abuse are also manifested in irreversible cognitive disorder such as:

  • damaged motor skills
  • difficulty performing basic verbal tasks
  • hallucinations
  • harming the ability for learning
  • inability for determining consequences and rational thinking
  • obsessive behavior
  • persecutory delusions

Meth effects on personality and behavior

The nervous system functions very fast under the influence of meth and the brain starts to send danger messages to the body. As a reaction, the body responds immediately to threats and prepares to fight or to run away (fight or flight response). This is why methamphetamine causes violent and psychotic behavior in people, and can often lead to loss of self control and aggressive outbursts.

Meth effects on the heart

Meth increases the heart rate and may cause tachycardia. It can often be the reason for heart attacks or strokes because addicts simply push their bodies to the limits without any rest, recuperation, nor renewal.

Meth effects on heart rate and blood pressure

Meth increases the blood pressure and may cause arrhythmias. A meth overdose can result in extremely high blood pressure and body temperatures which often leads to:

  • heart attach
  • irregular heartbeat
  • stopped heartbeat
  • stroke

Meth effects on the lungs and liver

Smoking meth can introduce many impurities in the lungs and damage the lung tissue. Materials used to cut crystal can block blood vessels in your lungs. Long term use can forever damage the function of your lungs.

Additionally, methamphetamine can lead to chronic liver inflammation (hepatitis).Such inflammations cause cell death and scarring of the liver tissue, which leads to liver injury. Long-term physical effects such as liver, and lung damage may have life threatening effects on meth addicts.

Meth effects on eyes and pupils

Methamphetamine users are usually recognize-able by their dilated pupils and bloodshot eyes. In fact, dilated pupils are one of the most obvious signs of meth abuse and addiction.

Meth effects on skin

Meth makes users feel a sensation as if bugs are crawling on or under their skin. It makes them scratch and pick at their skin a lot. The scratching leads to sores on the face, arms and legs.

Meth effects on teeth

Meth users usually have broken, stained, rotten teeth, and a dry mouth. They often drink or eat a lot of sweet and sugary products, which contributes to the tooth damage and decay.

Meth effects on sperm

According one study, meth use has a direct effect on male infertility. The effects of meth on sperm have been tested on rats. In many studies the results have shown that meth induces abnormal sperm morphology, lowers the sperm concentration and causes apoptosis (cell death) in the testicles of male rats.

Meth effects on pregnancy

Methamphetamine use during pregnancy affects the development of the brain, spinal cord, heart and kidneys of the baby. Plus, the use of meth during pregnancy can result in prenatal complications. These complications sometimes result in premature delivery and birth deformities of the baby. Further, children of mothers who abused meth during pregnancy may experience learning disabilities, growth and developmental delays. Some babies are born without parts of their limbs.

Meth effects on breast milk

Mothers that are meth addicts should not breastfeed. Methamphetamine and its metabolite, amphetamine, can be detected in breastmilk and in baby’s body after breastfeeding.

Several death cases in infants have been detected where the source of methamphetamine was a mother’s breastmilk. Even if an overdose never occurs, a baby’s ability to process information and communicate can be impaired, a child’s development can be delayed, and many other harmful consequences can appear later in life.

Meth effects questions

Do you have any questions about the effects of meth abuse on the body and brain? Feel free to post them in the comments section below. We try to provide personal and prompt answers to all legitimate inquiries, or we’ll refer you to someone who can.

Reference Sources: DEA: Methamphetamine
Illions Attorney General: Meth Evils
Lancaster: Devastating Effects of Methamphetamine
Arizona Attorney General: About Meth
Medline Plus: Methamphetamine overdose
NIH: Effects of Meth on Bodies and Brains
NCBI: Methamphetamine induces abnormal sperm morphology, low sperm concentration and apoptosis in the testis of male rats
SAMHSA: Tips for Teens-Methamphetamine
ND Health: Methamphetamine Use During Pregnancy
MAINE: Substance use and Breastfeeding
About the author
Lee Weber is a published author, medical writer, and woman in long-term recovery from addiction. Her latest book, The Definitive Guide to Addiction Interventions is set to reach university bookstores in early 2019.


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    1. If me and my boyfriend is having intercourse can I test postive for a hair follicle drug test? From the drug he takes.

  1. If a guy is on meth and busts a nut in me while im pregnant, does anything happen to my body or the baby because of it. Also, if the guy got me pregnant while he was on meth does that mean anything with the baby?

  2. I’ve been doing it now for about a year. I don’t think you understand it has a lot to do with the person who is using it. My mind is sharper , I’m able to function as well as I’ve ever had. Mentally in my opinion better then expected. See I went to see someone after my mother passed away in October of 2006… Let’s just say I was placed on all types of stuff depending on the Pharmaceutical companies new wonder drug! I’m being asked about how I felt before and meaning when I was a child on up. They telling me I’m depressed, bi-polar, and a few other things now I know I could have been all of them at one time but if you really wanna know how I feel only ask for present feelings. Cause I know how I feel only if your not giving just cause on certain things they need to create IT. By doing so they are missing out on helping people. Truly helping not just going with current trends. This shit is so deep the Pharmaceutical industry dictates current medical guidelines and education. I’m not bashing anyone in particular the information is available if you seek it . Nor am promoting any drug use, but if I wasit definitely wouldn’t be anything a Dr Gets paid to prescribe me.Hopefully prescribing kids highly addictive narcotics becomes illegal ( we can’t possibly have this many kids With ADHD. All of a sudden…

  3. To the previous comment: Chelsey M.Z., why are you trying to get pregnant if you know you are addicted to meth or whatever drug? Did it cross your mind that getting pregnant should be the last thing a drug addict should be attempting? I worked in the neonatal units where babies were born to such. Put your selfishness aside, kick the addiction, get your life together and then maybe attempt to get pregnant. Bloody hell, what a scary question….

  4. I have a concern I haven’t used meth in quite some time but I’m having a baby and it’s in my system from oral and having sex with somebody that is a meth user it’s in my blood and cos was called how can I prove that I’m not a user

    1. Hi, Yvanna. It is very unlikely that you will fail a drug test just by having a sexual intercourse with a meth user. Sometimes, certain prescription medications, or even some food can lead to false positive result. In this case I suggest you talk with a lab technician and consult a doctor. Also, for more info, you can download our free e-book ‘The Definitive Guide To Drug Testing’ to learn more about meth detection periods, here:

  5. If a man was born a meth addict baby and ended up using in his adult life, how long would the toxins from the meth affect his sperm? Thank you

  6. How can meth affect pregnancy if the male was using when the woman conceives And within the first few weeks of pregnancy, but the woman was not using at all. Can their still be bad side affects to the child?

    1. Hi Cammy. Addiction can affect sperm quality and development, and these defects can cause early miscarriage.
      But, more studies are needed to show a connection between birth defects to babies born to addicted fathers, unless their mother has the same addiction.

  7. Hi, my boyfriend use to do meth on the regular. He hasn’t messed with it now for 7 months. I’ve looked around on what long term effect it has on his sperm but haven’t gotten the answers I need. I’m just wanting to know if after usage and months of not using meth will his sperm count start to go back to normal or will we have problems trying to conceive?

  8. Well it’s a sad life I just left my be because of this damn drug…is the fuxking meth I hate it…it destroys families and life’s and kills. He couldn’t stop accusing me I realize he wasn’t gonna change so I ran out instead of sticking around for this b.s. they need professional help never think that they can do it on there own. So run away as far n as fast so you won’t get caught in there web of b.s. promises broken continuously Jesus lifestyle that’s the way to live that’s how I did it….god bless us all n our hearts amen

  9. I just broke off with a guy who said he uses little. Now I am worries he used it in my house and the walls or furniture is affected. Since being with this male I have lost weight, was spewing up as soon as opened my bedroom door after waking up. I wondered if it was my reaction as I am sensible. The other thing I was sweating slot when he slept beside me. He has been out for past week and no more sweating. Can I obserbed toxicians from him due to sex. How do I clean my home. Please let me know anything to stop myself worrying.

  10. If someone uses meth consistently and you don’t use, but consistently have unprotected sex with someone who uses (and they cum inside me regularly X2 a day) can it somehow get me high? I feel kinda weird all the time but i also get anxiety so i cant tell if I’m gacked, or just anxious.

  11. My friend has had an on going meth addiction for many years now, he’s 35 and I’ve told him it has direct effect on his ability to have children, his sperm ect, do you have any information you can send me to support this as I have talked him into receiving help and any information I can get him would be greatly appreciated.

  12. my boyfriend uses meth and he got me pregnant. Will it have abnormal effects on our child even if i have never used meth in my life?

    1. Hi Alexa. There are no current studies that the semen will affect you unborn child. The only studies that are made are only on babies born to addicted mothers.

  13. I’m trying to figure out what to do to get
    My breast back. Is it possible to take meth and balance it with healthy drugs or meals?

  14. why does meth usage “shrink” male penis and scrotum? I have tried to talk with my son about this. if i have concrete evidence to show him he may listen
    thank you for your help

  15. Hiya,
    I’m asking this question as I’m currently supporting a very dear friend of mine who got hooked on Meth so quickly that by the time I blinked a whole two years had flown past us and she was hooked in deep. Recently I caught wind of her trying for a baby with her partner whilst still smoking meth here and there… It’s been a year of them trying & nothing has come out of it…. My question is: “What exact effect does Meth take on a woman’s fertility”? I’ve read about the effects of male fertility , but there is a real lack of in depth information on the female fertility… Can you answer this for me?

  16. My husband does the same thing…he says I have another guy at home b coz it smells like sex…its the meth that makes him react like that…all I have to say is run…run away from that…

  17. My husband is doing meth he’s been accusing me of having a guy over when he sleeps. He says i know he’s here because it smells ugly i keep telling him theres no one but everyday he argues with me saying he going to catch him. He’s been sobor 2 days know why does he still think like this and how long will his brain think like this is driving me crazy

  18. I been using meth for a while now.My question is why does it look like my eyelids or eyes are sunken in is it due to not enough water or not enough sleep?

  19. Okay so what i did to prevent this all or at least minimize it was to take vitamins and lots of them, force myself to at least have three decent sized meals a day, drink tons of water, and i learned quickly how to relax your body and go to sleep, even if i was high. Control your doses and frequency and make rules for yourself and have consequences if you break them. I made rules but i broke them and didnt do anything about it. That is what led to me getting seriously hooked. Also, for a healthier roa, capsuling is the way to go. Just some advice and stay safe. But also be aware of how great being sober is and to those wanting to quit, you can do it and you can lead a happy life after meth i promise

  20. My son recently passed away and he had meth and Xanax in his system is what made that a deadly combination would HR have smoked it or what? Sorry a mother that is not familiar with this.

    1. Hi, Sandy. I’m really sorry for your loss. I’d suggest that you speak with a toxicologist or a coroner or another medical professional about your concerns. We’re not able to provide you with a qualified response. I wish you peace in this time of loss.

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