Fastin C is marketed as an appetite suppressant and weight loss pill. The chemical compound in the medication is phentermine hydrochloride, which is also branded as Adipex-P, Obenix, Teramine and Lonamin, according to Drugs.com and RxList. The site goes on to note that while the medication was designed for use in excessively overweight individuals, it has become popular among the general population of consumers seeking a weight loss remedy. Taking Fastin C with or without a prescription can result in side effects.
Allergic Reactions
Individuals with allergic reactions or sensitivity to drugs that stimulate the nervous system should not take Fastin C, according to Drugs.com. RxList notes that allergic reactions can include a swelling of the face, lips, or tongue, difficulty breathing and hives. Emergency medical help is recommended by RxList when these symptoms appear.
Headache
Both RxList and Drugs.com note that phentermine hydrochloride products such as Fastin C can cause headaches. As a stand-alone issue, this is considered to be one of the less serious side effects of taking Fastin C, but if the headaches are severe and combined with other side effects it can be a sign of a bad reaction to the medication, notes RxList.
Personality Changes
Drugs like Fastin C that contain phentermine hydrochloride can lead to personality changes in patients. Drugs.com notes that this can include irritability and hyperactivity. According to RxList, feeling nervous or anxious is one of the less serious side effects of the medication.
Intestinal and Evacuation Issues
Fastin C has been linked to intestinal issues attributed to the phentermine hydrochloride. RxList notes that this can include intestinal cramping and may lead to evacuation issues. Patients taking the medication have reported both diarrhea and constipation.
Addiction
Fastin C is designed to be taken for a few weeks only, but some patients find they are unable to quit. Drugs.com notes that it is possible to become psychologically dependent on the phentermine hydrochloride in Fastin C, and RxList encourages patients to monitor their intake due to the addictive power of phentermine hydrochloride products.
Primary Pulmonary Hypertension
Primary pulmonary hypertension is a rare side effect of taking drugs like Fastin C that contain phentermine hydrochloride. According to Drugs.com and RxList, the side effect can be fatal. Symptoms of primary pulmonary hypertension caused by phentermine hydrochloride include swollen ankles, shortness of breath, and chest pain. Drugs.com notes that these side effects of phentermine hydrochloride should prompt an immediate call to the doctor.
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