The drugs cause desired short-term disruptions in the brain, but they also cause undesirable long-term changes to the brain and other vital organs in the body, leading to drug addiction. Common drug addictions include: 1  Marijuana. 2  Heroin. 3  Cocaine/crack. 4  Synthetic drugs such as bath salts and spice.
1 Penicillin G, common vet prescriptions known as CrystacillinÂ® or Flo-CillinÂ®, is an antibiotic used to treat and prevent bacterial infections in dogs and cats. 2  This is a natural penicillin and is cultured from the bacteria Penicillium chrysogenum.
In higher doses, pseudoephedrine has been found to cause toxicity in dogs and can even be fatal if the dose administered is high enough, so never be tempted to give your pet dog Claritin D. Before giving Claritin or Benadryl to your pet dog, always seek advice from your veterinarian. Medications such as Claritin are specifically designed to treat humans rather than pets, so although they do have many useful applications for animals, they can also cause side effects such as dry eyes and increased thirst.